CHAMPION  ACCESSION 
LIBRABY 


BANCROFT 

LIBRARY 

ESTABLISHED  1876  INCORPORATED  1880 


1910 


ILLUSTRATED  CATALOGUE 

OF 


ASSAYERS'  AND  CHEMISTS' 


SUPPL  ES 


SCIENTIFIC  APPARATUS 


The  Denver  Fire  Clay  Co. 

W.  W.  CASE,  Jr..  FW  and  Mgt.  JOHN  DONALDSON.  Sec'y  and  Trea,. 


:  MANUFACTURERS  OF  = 


Crucibles,  Muffles,  Scorifiers,  Furnaces, 
Chemical  and  Physical  Apparatus, 
General  Laboratory  Supplies,  Etc. 


COPYRIGHT 


DENVER,   COLORADO,   AND    SALT   LAKE   CITY,    UTAH 

U.  S.  A. 

MAINSTORE:  1742-1746  Champa  St.,  Denver 
FACTORY:  3101-3147  Blake  St..  Denver 
UTAH  DEPT.:  156  South  Weft  Temple  St,  Salt  Lake  City,  Utah 
LENNON,  LTD..  Exclusive  South  African  Agents 


THE  DENVER  FIRE  CLAY  COMPANY. 


HIGHEST 


AWARDS 


GOLD  MEDALS 


ALL  WORLD'S  EXPOSITIONS 


THE  DENVER  FIRE  CLAY  COMPANY. 


DUTY-FREE    IMPORTATIONS. 

By  authority  of  Act  of  Congress,  June  22,  1874,  all  universities,  colleges,  schools, 
literary,  scientific  or  religious  societies  of  the  United  States  are  permitted  to  import, 
free  of  duty,  instruments,  books,  charts,  etc.,  to  be  used  in  connection  with  the  educa- 
tional exercises  of  the  institution  for  which  they  are  ordered.  We  have  made  special 
arrangements  in  this  branch  of  our  business  and  shall  be  pleased  to  receive  orders,  which 
we  fill  at  the  original  price  of  European  dealers. 

EXPORT  ORDERS. 

We  solicit  Export  Orders,  being  thoroughly  familiar  with  all  customs  regulations. 
Our  long  experience  in  this  business  enables  us  to  prepare  the  necessary  documents 
accurately,  insuring  our  customers  the  quickest  possible  service. 

SHIPPING. 

Unless  definite  shipping  instructions  are  given,  we  will  use  our  own  judgment,  for- 
warding by  cheapest  or  quickest  route. 

MAILING. 

Acids,  explosives,  gasoline  and  other  highly  inflammable  substances  are  prohibited 
from  the  mails.  It  is  not  advisable  to  mail  fragile  or  delicate  articles,  owing  to  the  risk 
of  breakage. 

PACKING. 

All  goods  are  packed  with  the  greatest  care  by  experienced  packers,  and  every  pre- 
caution is  taken  to  prevent  breakage  in  transit.  We  cannot,  however,  assume  responsi- 
bility for  safe  transportation.  Our  liability  ceases  when  goods  are  receipted  for  in  good 
condition  by  the  carrier. 

TERMS. 

Prices  in  this  catalogue  supersede  all  former  prices,  but  are  necessarily  subject  to 
change  without  notice,  as  market  fluctuates. 

Orders  from  parties  unknown  to  us  should  be  accompanied  by  cash  or  satisfactory 
references. 

Goods  will  be  sent  C.  O.  D.  if  requested,  but  only  if  remittance  is  made  sufficient  to 
cover  transportation  charges  both  ways. 

Sight  Draft  attached  to  Bill  of  Lading  on  all  orders  for  Cyanide,  Mercury,  Zinc 
Shavings,  Gold  and  Platinum. 

QUOTATIONS. 

Quotations  are  subject  to  change  without  notice,  and  when  made  from  stock  are 
subject  to  sale  of  quoted  goods  on  intervening  orders. 

DELIVERY. 

Sales  and  delivery  are  subject  to  strikes,  accidents,  or  other  causes  beyond  our 
control. 


Bancroft  Libnuy      THE  DENVER  FIRE  CLAY  COMPANY. 


Reference  Tables  and  Information 


COMPARISONS  AND  EQUIVALENTS. 


The  U.  S.  Standard  of  weight  is  Troy  pound,  and  was  copied  in  1827  from  the  imperial 
Troy  pound  of  England,  for  the  use  of  the  United  States  Mint,  and  there  deposited.  It 
is  standard  in  air  at  62°  Fahr.,  the  barometer  at  30  inches. 


24  grains  =     1  dwt. 
480        "       =20      "    =    1 
5760        "       =240      "    =12 


1  drachm  = 

16 

=    1  oz. 

256 

=   16  " 

6400 

=  400  " 

25600 

=  1600  " 

512000 

=  32000  " 

Troy  Weight. 


"  1  It.  =  22.816  cub.  in.  of  distilled  water  at  62°  Fahr. 
Avoirdupois  Weight. 

27.34375  grains  Troy. 
437.5 

1  lb.=    1.2153  Ib.  Troy. 

25    "   =   1  quarter. 
100    "   =   4        "       =1  cwt. 


=  2000 


=  80 


=  20 


=  1  ton. 


Apothecaries'  Weight. 


20  grains  =     1  scruple. 
60      "      =     3 

480       "       =    24 
5760       "       =288 


=   1  drachm. 


=  96 


=  12 


=  1  Ib. 


1  Milligramme 
1  Centigramme 
1  Decigramme 


Gramme 

Decagramme 

Hectogramme 

Kilogramme 

Myriagramme 

Quintal 

Tonneau 


Metric,  or  French  Weights. 

Troy 

Grammes          Grs. 
.001 =     .01543 
.01    =     .15432       Troy 
.1      =   1.5432          Ozs. 
=  15.432     =     .032  = 

= 321  = 

=  ..  .   3.215  = 


=  1. 

=  10. 

=  100. 

=  1000. 

=  10000. 

=  100000. 
= 1000000. 


Troy 
Lbs. 

.00267  = 
.02679  = 
.26792  = 

32.150=  2.6792    =35.2758    = 
26.792 


Avoir. 

Ozs.          Avoir.  Lbs. 
.03528  =         .0022047 
.022046 
.22046 
2.2046 


.3528    = 
3.52758  = 


; =     22.046 

.   267.92        = =    220.46 

.2679.2  ..=2204.6 


Assay  Ton  Weights. 


The  Assay  Ton  Weights  is  a  system  made  up  from  a  comparison  of  the  Avoirdupois, 
Troy  and  Gramme  Weights,  and  will  be  found  extremely  simple  and  useful,  saving  a  vast 
amount  of  calculation  and  labor. 

The  unit  of  the  system  is  the  assay  ton  =  29. 166  grammes.  Its  derivation  will  be 
seen  at  a  glance. 

1  Ib.  Avoirdupois  =  7,000  Troy  grains. 

2,000  Ibs.  =  1  ton. 

2,000  x  7,000  =  14,000,000  Troy  grains,  in  one  ton  Avoirdupois. 

480  Troy  grains  =  1  oz.  Troy. 

14,000,000  -=-  480  =  29,166  Troy  ozs.  in  2,000  Ibs.  Avoirdupois. 

There  are  29,166  milligrammes  in  one  assay  ton  (A.  T.) ;  hence 

2,000  Ibs.  is  to  1  A.  T.,  as  1  oz.  Troy  is  to  1  milligramme. 

Therefore,  if  1  A.  T.  of  ore  assays  1  milligramme  of  gold  or  silver,  the  ton  contains 
one  ounce  Troy. 


VI 


THE  DENVER  FIRE  CLAY  COMPANY. 


Long  Measure. 

The  standard  unit  of  the  United  States  and  British  linear  measure  is  the  yard.  It 
was  intended  to  be  exactly  the  same  for  both  countries,  but  in  reality  the  United  States' 
yard  exceeds  the  British  standard  by  .00087  of  an  inch.  The  actual  standard  of  length 
for  the  United  States  is  a  brass  scale  82  inches  long  prepared  for  the  Coast  Survey  and 
deposited  in  the  office  of  Weights  and  Measures  at  the  U.  S.  Treasury  Department  in 
Washington.  The  yard  is  between  the  27th  and  the  63d  inches  of  this  scale.  The  tem- 
perature at  which  the  scale  is  designed  to  be  standard,  and  at  which  it  is  used  in  the 
U.  S.  Coast  Survey  is  62°  Fahrenheit. 


Inches 

12  = 

36  = 

72  = 

198  = 

7920  = 

63360  = 


Foot 
1. 

3.    = 

6.    = 

16.5  = 


Yard 

1.  Fathom 

2.  =       1.          Perch 
5.5=       2.75=        1 


660.    =    220.    =   110.      =      40    = 
5280.    =1760.    =    880.     =   320    = 


190080  =  15840.    =5280.    =2640.      =    960    = 


Furlong 

1         Mile 

8=1        League 
24      =     3     =      1 


Metric,  or  French  Linear  Measure. 


1  Millimetre  .  .  . 
1  Centimetre  .  .  . 
1  Decimetre.  .  .  . 

Metre 
.  .  =           .001 
.  .  =           .01 
.  .  —           .1 

U.  S.  Ins. 
=       .03937 
=        .3937 
—      3.937 

Feet 
=           .00328 
=           .0328 
—           .32808  — 

Yards 
.10936 

1  Metre  

,                             H 

—    39.3704 

—         3  2808    — 

1  0936 

1  Decametre  .  .  . 

.  .  —     10. 

—  393.704 

—        32.808      — 

10.936 

1  Hectometre 

—    100. 

328  08        — 

109  36 

1  Kilometre  .  .  . 

.  —  1000. 



.    3280  8         — 

1093  6 

1  Mvriametre  .  . 

.  .  —  10000. 

— 

.  .  32808.            — 

10936. 

Miles 
.0621375 
.621375 


Solid  Measure. 

1,728  cubic  inches  =   1  cubic  foot. 
46,656  cubic  inches  =  27  cubic  feet  =  1  cubic  yard. 


Metric,  or  French  Cubic  or  Solid  Measure. 


1  Cubic  Centimetre  .  . 
1  Cubic  Decimetre..  . 
1  Centistere  

Cu.  Metres      U.  S.  Cu.  Ins. 
.  =       .000001  =         .061025 
.  =        .001       =      61.025 
.  —        .01         —    610  25 

1  Decistere.  ... 

—         1           —  61025 

1  Stere  

.  —      1.             —  - 

1  Decastere  

.  —  10.         —  .  . 

1  Hectostere  .  . 

-100. 

U.  S.  Cu.  Ft. 

.353156       U.  S.  Cu.  Yds. 
3.53156    =       .13080 
=      35.3156      =     1.3080 
=    353.156        =    13.080 


=  3531.56 


=  130.80 


Apothecaries'    Measure. 


Gallon       Pints      Ounces      Drams      Mins.      Cu.  Ins.         Grains         Cu.  C.M. 

1      =     8      =      128      =    1024    =61440  =  231.         =58328.886    =3785.00 

1      =       16      =     128    =    7680=    28.875    =   7291.1107=    473.11 

1      =         8    =     480=     1.8047=     455.6944=     29.57 

1    —        60=     0.2256=        56.9618=       3.70 


THE  DENVER  FIRE  CLAY  COMPANY. 


Vll 


Reference  Tables 


Comparison   of  Avoirdupois,   Metric,  Troy  and   Assay  Ton   Weights. 


1  Avoir.  Oz. 
1  Avoir.  Lb. 
1  Milligram. 
1  Centigram 
1. Decigram. . 
1  Gram 
1  Decagram.. 
1  Hectogram 
1  Kilogram 
1  Troy  Grain. 
1  Troy  Dwt . 
1  Troy  Ounce 
1  Troy  Pound 
1  Assay  Ton  . 


Avoir. 
Ounce. 

Avoir. 
Pound. 

Milligram. 

Gram. 

Troy 
Grain. 

Troy 
Dwu 

Troy 
Ounce. 

Troy 
Pound. 

1. 

.06250 

28349.5493 

28.349540       437.5 

18.22917 

.911458 

.07595483 

16. 

1. 

453592.6449 

453.5926449 

7000. 

291.66666 

14.583333 

1.215277 

.00003527394 

.03000220462 

1. 

.001 

.015432349 

.0006430145 

.000032150727 

.00000267922725 

.0003527394    .0000220462 

10. 

.01                 .15432349 

.006430145 

.00032150727 

.0000267922725 

.003527394      .000220462 

100. 

.1                   1.5432349 

.06430145 

.0032150727 

.000267922725 

.03527394        .00220462 

1000. 

1.                    15.432349 

.6430145 

.032150727 

.00267922725 

.3527394         .0220462 

10000. 

10.                 154.32349 

6.430145 

.32150727 

.0267922725 

3.527394         .  220462 

100000. 

100.               1543.2349 

64.30145 

3.2150727 

.267922725 

35.27394         2.20462 

1000000. 

1000.               15432.349 

643.0145 

32.150727 

2.67922725 

.00228571      ,.  000142857 

64.79897 

.06479897 

1. 

.041666 

.0020833 

.000173611 

.0548571         .0034285 

1555.1754 

1.5551754 

24. 

1. 

.05 

.0041666 

1.0971428 

.0685714 

31103.495 

31.103495 

480. 

20. 

I. 

.08333333 

13.165714 

.822857 

373241.9478 

373.2419478    5760. 

240. 

12. 

1. 

1.0288232 

29.166C666 

Table  to  Convert  U.  S.  Linear  Measure   Into   Metric  Linear  Measure. 

As  one  inch  is  equal  to  0.0254  meters;  to  convert: 

Inches into    meters multiply  by    0.0254 

"       centimeters "          "     2.5399 

.   "       millimeters..  "          "  25.3997 


Table  to  Convert  Metric  Linear  Measure   Into   U.  S.  Linear  Measure. 

As  one  meter  is  equal  to  39.370  inches;  to  convert: 

Meters into    Inches multiply  by  39.370 

Centimeters "  "      "          "     0.3937 

Millimeters...  .   "  "  "          "     0.03937 


Cubic   Measure,  U.  S.  Standard. 

1,728  cubic  inches  =   1  cubic  foot. 
46,656  cubic  inches  =  27  cubic  feet  =  1  cubic  yard. 

A  cubic  foot  of  water  weighs  62^  pounds,  and  contains  1,728  cubic  inches,  or 
gallons. 


Vlll 


THE  DENVER  FIRE  CLAY  COMPANY. 


Square  Measure,  U.  S,  Standard. 


Inches 
144  = 
1296  = 
39204  = 


Foot 

1. 

9.      = 
272.25  = 


Yard 

1.          Perch 
30.25=       1 


1568160  =  10890.     =1210.     =     40        Acre 
6272640  =  43560.      =4840.     =    160    =      1 


Square  Measure,  Metric. 


1  Sq.  Centimeter 
1  Sq.  Decimeter. . 

1  Centiare 

1  Are 

1  Hectare. . . 


Sq.  Meters         U.  S.  Sq.  In. 

.0001  =  .155 

.01  =  15.5 

1. 


=        1550.03      = 


Sq.  Feet 

.10764  = 
10.764      = 


100. 
10000. 


=    155003. 


=      1076.4 
=  107641. 


Sq.  Yards 

.01196       Acres 
1.196      =    .00024 
=      119.6         =    .0247 
=  11960.  =2.47 


Metric,  or  French  Dry  and  Liquid  Measure. 


1  Millilitre    .. 
1  Centilitre    . 

1  Decilitre    . 
1  Litre   

1  Decalitre    .. 
1  Hectolitre   . 
1  Kilolitre     . 
1  Myrialitre   . 


-LJ1HCO. 

U.  O.  ^U.  UCBi 

U.  S. 

Ml 

.061      =  j 

.00845 
.0018 

gill, 
pint  (dry). 

.01 

.61        = 

.0845 

gill. 

1 

.018 

pint  (dry). 

.1 

R  1                      ^ 

.845 

gill  =  .2113  pints. 

b.i           _  ^ 

.18 

pint  (dry). 

1. 

=        61.02        =  \ 

2.113 

pints  =  1.056  quarts. 

1.8 

pints  =  .908  q.  =  .1135  p 

10. 
100. 

=      610.16        =  J 
U.  S.  Cu.  Ft. 
=         3.531      =  j 

2.641 
9.08 
26.417 

2.837 

gallons. 
q.  =  1.135  p.  =  .283  b. 
gallons, 
bushels. 

1000. 

=       35.31       =  j 

264.17 
28.378 

gallons, 
bushels. 

10000. 

=     353.1          =  j 

2641.7 
283.7  ' 

gallons, 
bushels. 

Thermometer  Scales 


Celsius  or  Centigrade  symbol,  "C."     Fahrenheit  symbol,  "F."     Reaumur  symbol,  "R." 

The  zero  of  the  Scales  of  Reaumur  and  Centigrade  is  freezing  point  of  water,  marked 
in  each  case  0°,  while  the  intervening  space,  up  to  the  boiling  point  of  water,  is  divided 
in  the  former  case  into  80°,  and  in  the  latter  to  100°. 

In  the  Fahrenheit  Scale  the  freezing  point  is  represented  by  32°  and  the  boiling  point 
is  represented  by  212°,  the  intervening  space  being  divided  into  180°,  which  admits  of 
extension  above  and  below  the  points  named,  a  good  thermometer  being  available  for 
temperature  up  to  620°  Fahrenheit. 


THE  DENVER  FIRE  CLAY  COMPANY. 


IX 


The  use  of  the  Reaumur  Scale  is  confined  exclusively  to  Germany  and  Russia,  while 
the  Centigrade  Scale  is  used  throughout  the  rest  of  Europe.  The  Fahrenheit  Scale  is 
confined  to  England  and  her  colonies  and  the  United  States  of  America. 

A  variety  of  circumstances  arise  in  which  it  becomes  necessary  to  convert  readings 
from  one  scale  into  those  of  the  others,  in  which  case  the  following  rules  are  to  be 
observed: 

1.  To  convert  Centigrade  degrees  into  degrees  of  Fahrenheit,  multiply  by  9,  divide 
the  product  by  5  and  add  32. 

2.  To  convert  Fahrenheit  degrees  into  degrees  of  Centigrade,  subtract  32,  multiply 
by  5  and  divide  by  9. 

3.  To  convert  Reaumur  degrees  into  degrees  of  Fahrenheit,  multiply  by  9,  divide  by 
4  and  add  32. 

4.  To  convert  Fahrenheit  degrees  into  degrees  of  Reaumur,  subtract  32,  multiply 
by  4  and  divide  by  9. 

5.  To   convert  Reaumur   degrees  into   degrees   of  Centigrade,   multiply  by   5   and 
divide  by  4. 

6.  To  convert  Centigrade  degrees  into  degrees  of  Reaumur,  multiply  by  4  and 
divide  by  5. 


Reference  Tables 


Table  for  Estimating  the  Value  of  Silver  Per  Troy  Ounce  at  Different  Degrees 
of  Fineness,  Based  $0.50  Per  Ounce  1000  Fine. 

U.  S.  CURRENCY. 

To  find  the  present  market  value  of  silver  at  any  given  time,  add  2%  for  every  Ic 
above  50c.  Example:  To  estimate  the  value  of  1  ounce  of  silver  750  fine,  presuming  the 
market  value  of  silver  is  63c  per  ounce  for  silver  1000  fine,  which  is  13  cents,  or  26% 
above  the  computed  value  in  table  below,  thus:  One  ounce  of  silver  750  fine  is  worth 
37V2c  +  26%  =  471,4(5. 


Fine. 

$ 

Cents. 

Fine. 

$ 

Cents. 

Fine. 

$ 

Cents. 

Fine. 

$ 

Cents. 

10 

00.50 

260 

13 

510 

25.50 

760 

38 

20 

01 

270 

13.50 

520 

26 

770 

38.50 

30 

01.50 

280 

14 

530 

26.50 

780 

39 

40 

02 

290 

14.50 

540 

27 

790 

39.50 

50 

02.50 

300 

15 

550 

27.50 

800 

40 

60 

03 

310 

15.50  . 

560 

28 

810 

40.50 

70 

03.50 

320 

16 

570 

28.50 

820 

41 

80 

04 

330 

16.50 

580 

29 

830 

41.50 

90 

04.50 

340 

17 

590 

29.50 

840 

42 

100 

05 

350 

17.50 

600 

30 

850 

42.50 

110 

05.50 

360 

18 

610 

30.50 

860 

43 

120 

06 

370 

18.50 

620 

31 

870 

43.50 

130 

06.50 

380 

19 

630 

31.50 

880 

44 

140 

07 

390 

19.50 

640 

32 

890 

44.50 

150 

07.50 

400 

20 

650 

32.50 

900 

45 

160 

08 

410 

20.50 

660 

33 

910 

45.50 

170 

08.50 

420 

21 

670 

33.50 

920 

46 

180 

09 

430 

21.50 

680 

34 

930 

46.50 

190 

09.50 

440 

22 

690 

34.50 

940 

47 

200 

10 

450 

22.50 

700 

35 

950 

47.50 

210 

10.50 

460 

23 

710 

35.50 

960 

48 

220 

11 

470 

23.50 

720 

36 

970 

48.50 

230 

11.50 

480 

24 

730 

36.50 

980 

49 

240 

12 

490 

24.50 

740 

37 

990 

49.50 

250 

12.50 

500 

25 

750 

37.50 

1000 

50 

THE  DENVER  FIRE  CLAY  COMPANY. 


Reference  Tables 


The  Value  of  Gold  Per  Troy  Ounce  at  Different  Degrees  of  Fineness,  Based  on 
$20.6718  Per  Ounce  for  1000  Fine. 

U.  S.  CURRENCY. 


Fine. 

$ 

Cents. 

Fine. 

$ 

Cents. 

Fine. 

$ 

Cents. 

Fine. 

$ 

Cents. 

10 

20.67 

260 

5 

37.47 

510 

10 

54.26 

760 

15 

71.06 

20 

41.34 

270 

5 

58.14 

520 

10 

74.94 

770 

15 

91.73 

30 

62.02 

280 

5 

78.81 

530 

10 

95.61 

780 

16 

12.40 

40 

82.69 

290 

5 

99.48 

540 

11 

16.28 

790 

16 

33.07 

50 

1 

03.36 

300 

6 

20.16 

550 

11 

36.95 

800 

16 

53.75 

60 

1 

24.03 

310 

6 

40.83 

560 

11 

57.62 

810 

16 

74.42 

70 

1 

44.70 

320 

6 

61.50 

570 

11 

78.29 

820 

16 

95.09  ' 

80 

1 

65.37 

330 

6 

82.17 

580 

11 

98.97 

830 

17 

15.76 

90 

1 

86.05 

340 

7 

02.84 

590 

12 

19.64 

840 

17 

36.43 

100 

2 

06.72 

350 

7 

23.51 

600 

12 

40.31 

850 

17 

57.11 

110 

2 

27.39 

360 

7 

44.19 

610 

12 

60.98 

860 

17 

77.78 

120 

2 

48.06 

370 

7 

64.86 

620 

12 

81.65 

870 

17 

98.45 

130 

2 

68.73 

380 

'7 

85.53 

630 

13 

02.33 

880 

18 

19.12 

140 

2 

89.41 

390 

8 

06.20 

640 

13 

23.00 

890 

18 

89.79 

150 

3 

10.08 

400 

8 

26.87 

650 

13 

43.67 

900 

18 

60.46 

160 

3 

30.75 

410 

8 

47.55 

660 

13 

64.34 

910 

18 

81.14 

170 

3 

51.42 

420 

8 

68.22 

670 

13 

85.01 

920 

19 

01.81 

180 

3 

72.09 

430 

8 

88.89 

680 

14 

05.68 

930 

19 

22.48 

190 

3 

92.76 

440 

9 

09.56 

690 

14 

26.36 

940 

19 

43.15 

200 

4 

13.44 

450 

9 

30.23 

700 

14 

47.03 

950 

19 

63.82 

210 

4 

34.11 

460 

9 

50.90 

710 

14 

67.70 

960 

19 

84.50 

220 

4 

54.78 

470 

9 

71.58 

720 

14 

88.37 

970 

20 

05.17 

230 

4 

75.45 

480 

9 

92.25 

730 

15 

09.04 

980 

20 

25.84 

240 

4 

96.12 

490 

10 

12.92 

740 

15 

29.72 

990 

20 

46.51 

250 

5 

16.80 

500 

30 

33.59 

750 

15 

50.39 

1000 

20 

67.18 

WHY  ONE  OUNCE  OF   FINE  GOLD   IS  WORTH   $20.67. 

One  dollar  in  gold  coin  weighs 25.8    grains  Troy 

Ten  per  cent,  is  alloy  (copper) 2.58 

Therefore  the  weight  of  pure  gold  in  a  gold  dollar  is 23.22 

There  are  480  grains  in  a  Troy  ounce.     Therefore  480  -r-  23.22  =  20. 67,  or  the  value 
per  Troy  ounce  is  $20.67. 

As  an  example:     $800.00  in  gold  coin  weighs  43  ozs.  Troy;  90  per  cent,  is  fine  gold, 
or  38.7  ounces;  $800.00  divided  by  38.7  gives  a  value  of  $20.67  per  ounce. 


How  the   Ratio  of  16  to   1    is  Determined. 


One  silver  dollar  (by  law  of  U.  S.  90  parts  silver  and  10  parts  copper)  weighs 
grains;  $12.80  in  silver  coin  weighs  11  ounces  Troy  or  one  ounce  is  worth  $1.29+. 

$20.67  -=-$1.29+  =  16:1. 

(Taken  from  Richard  W.  Lodge's  "Notes  on  Assaying.") 


THE  DENVER  FIRE  CLAY  COMPANY. 


XI 


Reference  Tables 


Gramme  Table,  for  the  Assay  of  Cyanide  Solutions. 


If  4  Pint  of  Solu- 
tion gives  of  Fine 
Metal 

One  Ton  of  Solution  will 
give    Fine    Metal 

If  £  Pint  of  Solu- 
tion gives  of  Fine 
Metal 

One  Ton  of  Solution  will 
give   Fine  Metal 

Gramme 

Ozs. 

Dwts. 

Grs.                  Gramme 

Ozs. 

Dwts 

.       Grs. 

.0001 

0 

0 

5.5 

.0200 

2 

5 

20 

.0002 

0 

0 

11 

.  0300 

3 

8 

18 

.0003 

0 

0 

16.5 

.0400 

4 

11 

16 

.0004 

0 

0 

22 

.0500 

5 

14 

14 

.0005 

0 

1 

3.5 

.0600 

6 

17 

12 

.0006 

0 

1 

9 

.0700 

8 

0 

10 

.0007 

0 

1 

14.5 

.0800 

9 

3 

8 

.0008 

0 

1 

20 

.0900 

10 

6 

6 

.0009 

0 

2 

1.5 

.1000 

11 

9 

4 

.0010 

0 

2 

7 

.2000 

22 

18 

8 

.0020 

0 

4 

14 

.3000 

34 

7 

12 

.0030 

0 

6 

21 

.4000 

45 

16 

16 

.0040 

0 

9 

4 

.5000 

57 

5 

20 

.0050 

0 

11 

n 

.6000 

68 

15 

0 

.0060 

0 

13 

18 

.7000 

80 

4 

4 

.0070 

0 

16 

1 

.8000 

91 

13 

8 

.0080 

0 

18 

8 

.9000 

103 

2 

12 

.0090 

1 

0 

15 

1  .  0000 

114 

11 

16 

.0100 

1 

2 

22                   2.0000 

229 

3 

8 

Grain  Table,  for  the  Assay  of  Cyanide  Solutions. 


If  *  Pint  of  Solu- 
tion gives  of  Fine 
Metal 

One  Ton  of  Solution  will 
give    Fine    Metal 

If  i  Pint  of  Solu- 
tion gives  of  Fine 
Metal 

One  Ton 
give 

of  Solution  will 
Fine  Metal 

Grains 

Ozs. 

Dwts. 

Grs. 

Grains 

Ozs. 

Dwts.     Grs. 

.001 

0 

0 

3.5 

.060 

0 

8             23 

.002 

0 

0 

7 

.070 

0 

10              11 

.003 

0 

0 

11 

.080 

0 

11              23 

.004 

0 

0 

14.5 

.090 

0 

13              10 

.005 

0 

0 

18 

.100 

0 

14             22 

.006 

0 

0 

21.5 

.200 

1 

9             20 

.007 

0 

1 

1 

.300 

2 

4              19 

.008 

0 

1 

4.5 

.400 

2 

19            -16 

.009 

0 

1 

8 

.500 

3 

14              14 

.010 

0 

1 

12 

.600 

4 

9              12 

.020 

0 

3 

0 

.700 

5 

4              10 

.030 

0 

4 

12 

.800 

5 

19               8 

.040 

0 

6 

0 

.900 

6 

14                6 

.050 

0 

7 

11 

1.000 

7 

9                4 

In  case  of  accident  from  Cyanide  Poisoning,  the  following  remedies  are  recom- 
mended: Put  the  patient  into  a  hot  bath,  and  apply  cold  water  to  his  back  and  neck. 
In  cases  of  internal  poisoning,  vomiting  should  be  induced  by  emetics,  or  by  physical 
means. 

Freshly  precipitated  Carbonate  of  Iron,  obtained  by  mixing  equal  quantities  of 
Sodium  Carbonate  and  Ferrous  Sulphate,  is  recommended  for  internal  use. 

If  the  poisoning  is  the  result  of  inhaling  Prussic  Acid  Gas,  it  is  advisable  to  make 
the  patient  inhale  a  small  quantity  of  Chlorine  Gas,  Ammonia  or  Ether.  The  Chlorine 
Gas  can  be  quickly  made  and  applied  by  sprinkling  a  little  Bleaching  Powder  on  a  piece 
of  flannel  moistened  with  Acetic  Acid,  and  then  holding  the  flannel  to  the  nostrils  of  the 
patient. 


Xll 


THE  DENVER  FIRE  CLAY  COMPANY. 


Constants  of  the   Elements. 
Oxygen  =  16. 


Name 

Sym. 

Atomic 
Weight 

Deg.  C 
Melting  Pt. 

Sp.  Gr. 

Valence 

Aluminum  .  .  . 
Antimony.  .  . 
Argon  

Al 
Sb 
A 

As 

Ba 
Be 
Bi 
B 

Br 
Cd 

Cs 
Ca 

C 

Ce 
Cl 
Cr 
Co 

Cu 
Di 
Er 
F 
Ga 
Ge 
Au 

H 
Ir 
Fe 
In 
I 
La 

Pb 
Li 

Mg 
Mn 
Hg 

Mo 

Ni 

Nb 
N 
Ng 
Os 
O 
Pd 
P 
Pt 
K 
Rh 
Ra 

27.1 
120.2 
39.9 
75.0 

137.4 
9.08 
208.5 
11.0 

79.96 
112.4 

132.9 
40.1 
12.0 

140.25 
35.45 
52.1 
59.0 

63.3 
142.12 
166.0 
19.0 
70.0 
72.5 
197.2 

1.008 
193.0 
55.9 
115.0 
126.97 
138.9 

206.9 
7.03 
24.36 
55.0 
200.0 
96.0 
58.7 

93.81 
14.04 
218.92 
191.0 
16.00 
106.5 
31.0 
194.8 
39.15 
103.0 
225.0 

700 
432 

2.58 
6.7 

3 
3,  5 

Tin-  white  metal. 
Bluish-white   brittle  metal. 
Colorless,  odorless  gas. 
Crystalline  solid.    Volatilizes  at 
450°  C. 
White  metal. 
Steel-colored,  hard  crystals. 
Reddish-white  metal. 
Red-brown  powder,  infusible  at 
white  heat. 
Brown-red   liquid.    Suffocating 
odor. 
Malleable,    ductile,    crystalline 
metal. 
Silver-white,  ductile  metal. 
Pale  yellow  metal. 
Practically  infusible.   Diamond  > 
graphite. 
Steel  gray.   Burns  in  Cl. 
Greenish-yellow  gas. 
Light  green  powder. 
Harder  than  iron,  malleable, 
ductile. 
Red,  malleable,   ductile  metal. 
White,  ductile  metal. 
Not  isolated. 
Colorless  gas. 
Gray,  soft  metal. 
White,  brittle  metal. 
Soft,  yellow,  malleable,  ductile 
metal. 
Colorless  gas. 
Hard,  white,  lustrous  mass. 
Gray  metal. 
White  non-crystalline  metal. 
Dark,  iron-gray  solid. 
Iron-gray,     malleable,     ductile 
metal 
Bluish-white  metal. 
Gray  metal. 
White   malleable  metal. 
Gray,  brittle  metal. 
Silvery-  white  liquid  metal. 
White,  brittle  metal. 
White,  hard,  ductile,  malleable 
metal. 
Steel-gray  lustrous  metal. 
Colorless,  odorless  gas. 
Reddish-white  metal. 
Lustrous,  blue-white  metal. 
Colorless,  odorless  gas. 
White,  malleable,  ductile  metal. 
Transparent  solid,  also  red. 
White,  malleable,  ductile  metal. 
White,  soft  metal. 
Very  hard,  white  metal. 

Arsenic  

5.73 

3.75 
1.85 
9.75 
2.53 

3.19 
8.67 

1.88 
1.7 
2—3.5 

6.63 

3,  5 

2 
2 
3,  5 
3 

1,  5 

2 

1 
2 
4 

3,  4 
1,  3—7 
2,  3,  6 
2,  3 

1,  2 
3 
3 
1 
3 
2,4 
1,3 

1 
3,4 
2,3 
3 
1,5,7 
3 

[2,4 

2 
2,3,4,6,7 
1.2 
2,3,4,6 
2,3 

5 
1—5 

Barium  

1200 
950? 
268 
2000+ 

—7.2 
320 

26 
Med. 

? 

850 
—33.6 

1775+ 
1500 

1054 
900? 
j 

Beryllium  .  .  . 
Bismuth  

Boron  

Bromine  

Cadmium  .... 
Caesium  

Calcium  

Carbon  

Cerium  

Chlorine  

Chromium  .  .  . 
Cobalt  

6.81 
8.96 

8.91 
6.54 

Copper  

Didymium  .  .  . 
Erbium  

Floiirine  

Gallium  

30 
900 
1045 

5.95 

5.47 
19.3 

0.069 
22.42 
7.85 
7.20 
4.95 
6.16 

11.37 
0.59 
1.75 
7.15 
13.59 
8.56 
8.90 

7.06 

Germanium  .  . 
Gold  

Hydrogen  .  .  . 
Iridium  

1950 
1550t 
176 
114 
870 

326 
180 
500 
1800 
—38.8 
1775+ 
1450 

? 

Iron  

Indium  

Iodine  

Lanthanum.  . 
Lead  

Lithium  

Magnesium  .  . 
Manganese  .  . 
Mercury  
Molybdenum 
Nickel  

Niobium  .... 
Nitrogen  .... 
Norwegium.  . 
Osmium  

254 

22.48 
1.10 
11.4 
1.81 
21.48 
0.87 
12.1 

2—8 
2 
2,4 
3,  5 
2,4 
1 
2,3,4 

Oxvgen  

Palladium  .  .  . 
Phosphorous  . 
Platinum.  .  .  . 
Potassium  .  .  . 
Rhodium  .... 
Radium  

1360 
45 
1775 
63 
2000 
? 

THE  DENVER  FIRE  CLAY  COMPANY. 


Xlll 


Constants  of  the   Elements — (Cont.) 


Name 

Sym. 

Atomic 
Weight 

Deg.  C. 
.Melting  Pt. 

Sp   Gr. 

Valence 

Ruthenium  .  . 

Rubidium.  .  . 
Samarium  .  .  . 

Ru 

Rb 

Sm 

101.7 

85.5 
150.0 

2000 
38 

11. 
1.52 

2—8 

1 

White,  lustrous,  heavy,  brittle 
metal. 
Wax-like  lustrous  metal. 
Not  isolated. 

Scandium 

Sc 

44.1 

Not  isolated. 

Selenium  .... 
Silicon  

Se 
Si 

79.2 
28.4 

217 
1200 

4.6 
2.0 

2,  4 

4 

Amorphous  and  crystallinesolid. 
Amorphous,    graphoidal,    ada- 

Silver 

Ag 

107.93 

954 

10.51 

1 

mantine. 
Whitest  of  all  metals. 

Sodium  

Na 

23.05 

96 

0.97 

1 

Whitish,  soft  metal. 

Strontium  .  .  . 
Sulphur  

Sr 

s 

87.6 
32.06 

? 
li4 

2.4 
2.03 

2 
2,  4,  6 

Brass-yellow,  malleable  metal. 
Yellow,  brittle  metal. 

Tantalum  .  .  . 
Tellurium  .  . 
Terbium.  . 

Ta 
Te 
Tr 

183.0 
127.6 
160.0 

? 

455 
? 

10.78 
6.24 

5 
2,  4 
3 

Black  powder,  metallic  lustre. 
Amorphous  and  crystallinesolid. 
Not  isolated. 

Thallium  
Thorium  .... 
Tin  
Titanium 

Tl 
Th 
Sn 
Ti 

204.1 
232.5 
119.0 
48.1 

294 
? 
233 
? 

11.8 
11.0 
7.29 

1,  3 
4 
2,4 
3,  4 

Bluish-white  metal. 
Grayish-white  powder. 
Lustrous  white  metal. 
Black,  lustrous  powder. 

Tungsten  .... 
Uranium  .... 
Vanadium.  .  . 
Ytterbium  .  . 

Wo 
U 
V 
Yb 

184.0 
238.5 
51.2 
173.0 

? 
Med. 
? 
? 

19.13 
18.68 
5.5 

2—6 
4,6 
2—5 
3 

Steel-gray,  crystalline  powder. 
Grayish-  white  metal. 
Light  gray  lustrous  powder. 
Has  not  been  isolated. 

Yttrium 

Y 

89.0 

? 

3 

Dark  grav  powder. 

Zinc  

Zn 

65.4 

419 

7.14 

2 

Bluish-white  metal. 

Zirconium  .  . 

Zr 

90.5 

9 

4 

Black  powder  and  grayish  sol  id 

Freezing,  Fusing,  and  Boiling  Points. 


Substances 

Fahrenheit 
Degrees 

Centigrade 
Degrees 

Reaumur 
Degrees 

Bromine  freezes  at  

—  7.6 

—  22 

—  17  6 

Olive  oil  freezes  at  

50 

10 

8 

Quicksilver  freezes  at 

—  39 

—  39  4 

—  31  5 

Water  freezes  at  

32 

0 

0 

Bismuth  metal  fuses  at  

507 

264 

211 

Copper  fuses  at  

2200 

1204 

963 

Gold  fuses  at  

2518 

1380 

1105 

Iron  fuses  at  

2800 

1538 

1230 

Lead  fuses  at  

617 

325 

260 

Potassium  fuses  at  

144  5 

62  5 

50 

Silver  fuses  at  .  

1832 

1000 

800 

Sodium  fuses  at     .    . 

204 

95  6 

76  5 

Sulphur  fuses  at  

239 

115 

92 

Tin  fuses  at  

442 

228 

182 

Zinc  fuses  at 

773 

412 

329  6 

Alcohol  boils  at  

167 

74.4 

63 

Bromine  boils  at  

145 

63 

50 

Ether  boils  at  

96 

35.5 

28.4 

Iodine  boils  at  

347 

175 

140 

Water  boils  at  

212 

100 

80 

XIV 


THE  DENVER  FIRE  CLAY  COMPANY. 


Specific  Gravity. 


Name  of  Substance 

Specific 
Gravity 

Name  of  Substance 

Specific 
Gravity 

Metals 
Platinum,  rolled  

22.009 

Stones  and  Earth 
Salt   common 

2   130 

Gold,  22  carats  fine  

17.486 

Saltpetre  

2  090 

Lead,  pure  

11.330 

Sulphur  native  

2  033 

Silver,  pure  

10.474 

Common  Soil 

1  984 

Copper,  wire  and  rolled  

8.878 

Clay 

1  900 

Copper    pure  

8.788 

Brick 

2  000 

Bronze,  gun  metal  

8.500 

Sand  

2  650 

Brass,  common  

8.500 

Lime  quick     .  .  . 

1  500 

Steel,  cast  steel  '. 

7.919 

Charcoal 

441 

Steel,  common  soft  

7.833 

Steel,  hardened  and  tempered  

7.818 

Liquids 

Iron,  pure  

7.768 

Alcohol   pure 

792 

Iron,  wrought  and  rolled  

7.780 

Oil  linseed 

940 

Iron,  hammered  

7.789 

Oil   turpentine 

870 

Iron   cast     

7  207 

Water    distilled   (62  425  Ibs    per 

Tin,  English  

7.201 

cu.  ft  ) 

1  000 

Zinc,  rolled  

7.101 

Water  sea 

1  030 

Antimony  

6.712 

Stones  and  Earth 

Gases  and  Vapors 
Ammonia  Gas  

.5894 

Glass  flint  

3.500 

Carbonic  acid 

1  5201 

Glass  bottle  

2.732 

Light  carbureted  hydrogen 

5527 

Marble,  common  

2.686 

Oxygen  

1   1056 

Slate  

2.800 

Sulphureted  hydrogen  . 

1   1747 

Stone  common  

2.520 

Steam  at  212°F.    . 

4880 

The  specific  gravity  of  a  body  is  the  ratio  between  its  weight  and  the  weight  of  a 
like  volume  of  distilled  water  at  a  temperature  of  39.2°  F.  For  gases,  air  is  taken  as 
the  unit.  One  cubic  foot  of  water  at  39.2°  F.  weighs  62.425  pounds. 


CORRECT  NAMES  FOR  SOME  OF  THE  MORE  COMMON  CHEMICALS. 

Aqua  Fortis   Nitric  Acid 

Aqua  Regia Nitric  and  Muriatic  Acids 

Baryta Barium  Oxide 

Barytes   Barium  Sulphate 

Blue  Stone,  Blue  Vitriol  Copper  Sulphate 

Borax Sodium  Borate 

Brimstone   Sulphur 

Butter  of  Antimony  Antimonious  Chloride 

Calomel Mercurous  Chloride 

Chalk Calcium  Carbonate 

Copperas,  Green  Vitriol  Iron  Sulphate 

Corrosive  Sublimate Mercuric  Chloride 

Cream  of  Tartar Potassium  Bitartrate 

Epsom  Salts Magnesium  Sulphate 

Fowler's  Solution Potassium  Arsenite 

Glauber's  Salts  Sodium  Sulphate 

Gypsum  Calcium  Sulphate 

Horn  Silver Silver  Chloride 

Hartshorn Ammonia  Water 

Hypo  Sodium  Hyposulphite 

Laughing  Gas Nitrous  Oxide 

Lime Calcium  Oxide 

Lime  Water Calcium  Hydrate 

Litharge Lead  Oxide 

Lunar  Caustic  Silver  Nitrate 

Liver  of  Sulphur Potassium  Sulphide 

Magnesia    Magnesium  Oxide 

Meerschaum Magnesium  Silicate 


THE  DENVER  FIRE  CLAY  COMPANY.  xv 


Mosaic  Gold   Tin  Bisulphide 

Nitre Sodium  Nitrate 

Nitre-Cake Sodium  Bisulphate 

Oil  of  Vitriol  Sulphuric  Acid 

Prussian  Blue   Ferric  Perro-Cyanide 

Prussic  Acid  . Hydrocyanic  Acid 

Pyro   Pyrogallic  Acid 

Quicksilver    Mercury 

Red  Lead   Lead  Oxide 

Red  Precipitate  Red  Mercuric  Oxide 

Rochelle  Salts Potassium  and  Sodium  Tartrate 

Salt  (common)    Sodium', Chloride 

Saltpetre   Potassium  Nitrate 

Salt  Cake Sodium  Sulphate 

Sal-Ammoniac   Ammonium  Chloride 

Sal-Soda  Sodium  Carbonate,  Cryst. 

Sal-Volatile   •  • • Ammonium  Bicarbonate 

Soda  Ash Sodium  Carbonate 

Spirits  of  Salt  Muriatic  Acid 

Sugar  of  Lead  Lead  Acetate 

Tartar -Emetic   •. Antimony  and  Potassium  Tartrate 

Verdigris  Copper  Sub-Acetate 

Vinegar  Acetic  Acid 

Water  Glass  Sodium  Silicate 

White  Lead Lead  Carbonate 

White  Precipitate  Mercuric-Ammonium  Chloride 

White  Vitriol  . .  Zinc  Sulphate 

White  Zinc   .  Zinc  Oxide 


PACKAGES— ACIDS. 

Commercial  acids  are  shipped  in  the  following  packages: 

Sulphuric  66°  Be Tank  Cars,  Drums  and  Carboys 

Nitric  acid  Commercial Carboys 

Muriatic  acid  Commercial Wooden  Tank  Cars,  Carboys 

Mixed  acids  or  powder  acids Tank  Cars,  Drums  and  Carboys 

Ammonia  Tank  Cars,  Drums  and  Carboys 

All  chemically  pure  acids  and  ammonia  are  shipped  in  glass.     5  Pint  Bottles  and 
1  Ib.  Bottles  and  Carboys. 

5  Pint  Bottle  of  C.  P.  Sulphuric  Acid  contains  9  Ibs. 
5  Pint  Bottle  of  C.  P.  Nitric  acid  contains  7  Ibs. 
5  Pint  Bottle  of  C.  P.  Hydrochloric  acid  contains  6  Ibs. 
5  Pint  Bottle  of  C.  P.  Ammonia  contains  4^  Ibs. 

All  5-pint  bottles  are  packed  neatly  and  securely  in  a  barrel,  16  bottles  to  the  barrel, 
weighing  as  follows: 

Net  weight  Approx.  Shipping 

of  contents.  weight. 

Sulphuric  acid    144  Ibs.  220  Ibs. 

Nitric   acid    112  Ibs.  190  Ibs. 

Hydrochloric  acid   96  Ibs.  175  Ibs. 

Ammonia    .'....       72  Ibs.  150  Ibs. 

Carboys  as  follows: 

Sulphuric  acid,  C.  P 200  Ibs.  260  Ibs. 

Nitric  acid,  C.  P 155  Ibs.  215  Ibs. 

Hydrochloric  acid,  C.  P 125  Ibs.  185  Ibs. 

Ammonia,  C.  P 100  Ibs.  160  Ibs. 

Commercial  acids  and  ammonia  in  carboys  weigh  approximately  the  same  as  C.  P. 
acids. 

Sulphuric  acid  66°  Be.  is  shipped  in  tank  cars  of  a  capacity  of  30,000  to  65,000  pounds. 
Sulphuric  acid  60°  Be.  shipped  in  tank  cars  with  a  capacity  of  60,000  pounds. 
Sulphuric  acid  66°  Be.  shipped  in  drums  weighing  1,600  Ibs.  net. 


xvi  THE  DENVER  FIRE  CLAY  COMPANY. 


Carboys  are  charged  at  $2.00  each,  acid  drums  at  $8.00  each,  aqua  ammonia  drums 
at  $10.00  each,  all  returnable  at  the  same  price  (if  in  good  condition),  less  freight  to 
Denver  or  Salt  Lake  City. 

Carboys  not  bearing  our  brand  are  returnable  at  $1.00  each  provided  both  carboy 
and  box  are  in  good  condition  when  received. 

Five  pint  bottles  are  not  returnable  under  any  circumstances,  as  we  prefer  to  use  new 
bottles  exclusively  for  our  C.  P.  goods. 

Aqua  ammonia  may  be  had  in  the  following  packages: 
Iron  drums,  holding  about  750  pounds  net. 
Carboys,  holding  about  100  pounds  net. 
Bottles,  holding  5  pts.  4%  pounds  net. 

CARE  OF  PACKAGES. 

When  drums  are  emptied  always  see  that  the  plugs  are  greased  before  replacing, 
so  as  to  avoid  air  or  water  entering  the  drum.  Always  keep  them  under  cover  and  in  a 
dry  place;  even  moisture  coming  in  contact  with  acid  drums  sometimes  causes  their  ruin. 

Carboys  should  not  be  exposed  to  the  action  of  the  sun  or  rain,  as  by  prolonged 
exposure  the  box  would  become  worthless  and  would  have  to  be  re-packed. 

When  returning  empty  packages  always  place  a  tag  on  them,  sending  us  bill  of 
lading  so  we  may  know  from  whom  they  come,  and  avoid  mistakes. 

Keep  all  carboys  of  nitric  acid  out  of  the  sun  and  in  a  cool  place,  as  heat  expands 
the  acid,  and  it  is  liable  to  run  over  the  top  and  set  fire  to  the  carboy  box. 

Do  not  lay  barrels  of  C.  P.  acids  on  their  side,  or  set  them  wrong  end  up,  as  this  will 
almost  invariably  cause  them  to  leak,  entailing  a  loss  of  acid,  and  in  the  case  of  nitric 
acid  will  set  fire  to  the  barrel  and  packing. 

In  the  event  of  fire  occurring  from  the  action  of  nitric  acid  upon  straw  or  other 
carbonaceous  matter,  be  very  careful  not  to  inhale  the  fumes  arising,  as  serious  con- 
sequences might  ensue,  several  deaths  having  occurred  from  this  cause.  The  nitric  acid 
fumes  alone  are  practically  harmless;  the  danger  appears  to  be  only  when  coming  in 
contact  with  the  material  which  takes  fire. 

RETURNING   EMPTY   CYLINDERS. 

Please  oblige  us,  and  indirectly  the  trade  as  well,  by  returning  all  empty  cylinders 
promptly,  declaring  same  on  way  bills  as  "Empty  Iron  Drums  Returned,"  and  mailing  us 
the  bill  of  lading  with  the  package  number  entered  therein. 


IF   IMPURITIES  ARE  SUSPECTED   IN   C.   P.  ACIDS  TESTS   FOR  SAME  ARE 

AS  FOLLOWS: 

Hydrochloric  Acid. 

FOR  IRON. — Dilute,  and  add  KSCN;  if  it  shows  a  red  color  there  is  iron  present. 

FOR  ARSENIC. — Dilute,  pass  in  hydrogen  sulphide  gas;  if  a  distinct  yellow  precip- 
itate is  obtained  it  would  indicate  traces  of  arsenic;  also  try  by  the  Marsh  test. 

FOR  SULPHURIC  ACID. — Dilute,  add  barium  chloride;  a  white  precipitate  would 
be  obtained  if  sulphuric  acid  were  present. 

Nitric  Acid. 

FOR  CHLORINE. — Add  silver  nitrate;  if  slight  opalescence  occurs,  it  shows  presence 
of  chlorine. 

Sulphuric  Acid. 

FOR  ARSENIC. — Dilute  and  pass  in  hydrogen  sulphide  gas;  if  a  distinct  yellow 
precipitate  is  the  result  it  shows  the  presence  of  arsenic;  also  try  by  the  Marsh  test. 

FOR  IRON. — Dilute,  add  KSCN;  if  red  color  appears  it  shows  presence  of  iron. 

In  making  these  tests  extreme  care  should  be  taken  that  all  of  the  glassware  and 
apparatus  used  in  the  tests  are  absolutely  free  from  the  impurity  tested  for;  also  make 
tests  on  the  distilled  water  to  be  used  in  the  examination,  so  as  to  be  sure  the  water  is 
perfectly  pure. 


THE  DENVER  FIRE  CLAY  COMPANY. 


XVll 


ANTIDOTES   FOR   POISONS. 

First. — Send  for  a  physician. 

Second. — Induce  vomiting,  by  tickling  throat  with  feather  or  finger;    drinking  hot 
water  or  strong  mustard  and  water.    Swallow  sweet  oil  or  whites  of  eggs. 

Acids  are  antidotes  for  Alkalies,  and  vice  versa. 


SPECIAL   POISONS  AND  ANTIDOTES. 

Acids — Muriatic,   Oxalic,   Acetic,   Sulphuric   (Oil  of  Vitriol),   Nitric,    (Aqua  Fortis). 
Soap-suds,  magnesia,  lime-water. 

Prussic  Acid-     Ammonia  in  water;  dash  water  in  face;  give  solution  cobalt  nitrate. 

Carbolic  Acid.     Flour  and  water,  mucilaginous  drinks. 

Alkalies — Potash,  Lye,  Hartshorn,  Ammonia.     Use  vinegar  or  lemon  juice  in  water. 

Arsenic — Rat  Poison,  Paris  Green.     Use  milk,  raw  eggs,  sweet  oil,  lime-water,  flour 
and  water. 

Bug    Poison — Lead,    Saltpetre,    Corrosive   Sublimate,    Sugar   of   Lead,   Blue   Vitriol. 
Use  white  of  eggs  or  milk  in  large  quantities. 

Chloroform — Chloral,  Ether.     Dash  cold  water  on  head  and  chest;  artificial  respira-1 
tion. 

Carbonate  of  Soda — Copperas,  Cobalt.     Use  soap-suds  and  mucilaginous  drinks. 

Iodine — Antimony,    Tartar   Emetic.     Use    starch    and    water    astringent    infusions; 
strong  tea. 

Mercury  and  its  Salts.    Use  whites  of  eggs,  milk  mucilages. 

Opium — Morphine,  Laudanum,  Paregoric,  Soothing  Powders  or  Syrups.     Use  strong 
coffee,  hot  bath;  keep  awake  and  moving  at  any  cost. 


We  make  a  specialty 
of  duty-free  importa- 
tions for  Schools,  Col- 
leges and  Universities 


XV111 


THE  DENVER  FIRE  CLAY  COMPANY. 


TELEGRAPHIC   CODE. 

In  addition  to  code  shown  below,  we  use  the  Western  Union  Telegraph  Code. 
(Universal  Edition  and  A.  B.  C.  Code.) 


CORRESPONDENCE. 
Orders  and   Shipments. 


Etracist. . 
Ebacot. . 
Ebactor . 
Ebaisser. 
Ebangas . 
Ebapo. . . 
Ebase. . . 
Ebatage . 
Ebater. . 
Ebatido . 
Ebatude . 
Ebbacy. . 
Ebbess. . 
Ebbey . . . 
Ebbott . . . 

Ebceder. 


Ebdals .  . 


Ebdomen . 
Ebduce . . 

Ebed 

Ebenot. . . 
Ebenson. 


.Ship  immediately. 
.  Ship  soon  as  possible. 
.  Ship  by  rail. 
.Ship  by  express. 
.Ship  by  quickest  route. 
.Can  you  ship? 
.When  will  you  ship? 
.Have  you  shipped?  ' 
,  If  not,  when  will  you  ship? 
.  Our  order  of  the — . 
.Enter  our  order  for — . 
.Specifications  to  follow. 
.Hasten  shipment  of — . 
.We  are  entirely  out  of — . 
We  must  have. 

.  Ship  what  you  have  ready  and 
let  balance  follow  soon  as 
possible. 

.If  you  cannot  ship  in  time 
named,  advise  us  by  tele- 
graph. 

.Send  tracer  for  shipment. 
.We  cannot  use. 
.Do  not  want. 
.Do  not  substitute. 
.You  can  substitute. 


Eberring. 
Ebetted . . 

Ebhor 

Ebidance. 
Ebider. . . 
Ebiding.  . 
Ebin. . 


Ebject.  .. 
Eblaze. .  . 
Eblemar . 
Eblepsy. . 


Eblette.. 
Eblude. . 
Ebluent. 
Ebode. . 


Eboding. 
Ebolie . . 
Ebondie . 
Ebound . 
Eboutir. 
Ebrade. . 
Ebrazar. 
Ebreyer. 


STOCK. 
Questions. 


Bbridge . 
Ebriter. . 


Ebrupt . . 


Ebsolve . . 
Ebsorb .  . , 

Ebstain. . 
Ebsterge . 
Ebsterse. 


Ebusing.  . 

Ebusive. . 
Ebutment . 

Ebutilon.  . 


How  soon  could  you  furnish? 
.How  soon  and  at  what  price 

could  you  furnish? 
,  Have  you  in  stock  and  could 

you  furnish  at  once? 

Answers. 


Ebscess. 
Ebscind. 
Ebsist.  . 


.  We  will  ship. 

.  We  will  make  shipment. 

.We  will  complete. 
.We  expect  to  ship. 
.  We  have  shipped. 
.  We  have  not  shipped. 

Sight  draft  attached  to  bill  of 

lading. 

.  We  can  ship. 
.  We  cannot  ship. 

.We  have  ready  for  shipment. 
.  Shall  we  ship  what  we  have 
ready? 

.We  have  no — but  will. 
.  Ship  other  sizes  promptly. 
.  We  cannot  promise  definitely. 
.We  have  been  disappointed  in 
delivery  of. 

.We  have  entered  order. 
.Shall  we  enter  order? 
.We  are  now  loading. 
.Your  order  of  the — . 
.Will  promise  to  ship  in — . 
.Can  you  use? 
.  Do  you  want? 
.Can  we  substitute? 


Could  you  furnish  within — ? 
If  so,  enter  order. 

.If   not    how    soon    could    you 
furnish? 


We  have  in  stock. 
.We  have  in  stock  and  could 

ship  at  once. 
.We  could  ship. 
We  could  probably  ship  in — . 
If    ordered    by    telegraph 
promptly. 


Ebftract. . .  .We  could  ship  in — . 
Ebstruse. . .  We  have  none  in  stock. 
Ebsume ....  We  have  no —  in  stock. 

Ebsurd Cannot  promise  positively,  but 

think  we  could  ship — . 
Eburega. .  .  .On  receipt  of  order. 
Ebusage.  . .  .After  receipt  of  order. 
Ebusaid.  . .  .If  ordered  immediately. 


PRICES. 
Questions. 


.At  what  price  could  you  fur- 
nish? 

.  Quote  us  lowest  prices  on — . 
Quote  lowest  prices  and  best 
terms  on — . 

.What  is  the  price  of — ? 


Ebuttal Has  there  been  any  change  in 

price  of — ? 

Ebyss :  We  are  offered — . 

Ecabalar. . .  Will  you  hold  offer  open? 
Ecabit Will  you  allow  us? 


The  following  system  may  be  used  for  coding  numerals,  in  sending  telegrams,  for 
figures  that  would  otherwise  require  more  than  one  word: 

1234567890    Repeat, 
chemistryx      w 


A  Crucible  Drying  Room 


Kiln  Yard. 


CONTENTS 


(For  Special  Index  Refer  to  Page  412.) 

PART  I—  Pages  i  to  303 

Chemists*  and  Assayers'  Laboratory  Supplies. 
PART  II-  Pages  304  to  331 

Special  Chemical  Apparatus  for  Analytical  Work. 
PART  III -     -          Pages  332  to  365 

Estimate  of  Laboratory  Equipment. 
Outfits  for  Assayers  and  Prospectors. 
School  Sets  of  Chemical  Apparatus. 
Collection  of  Minerals,  Models  and  Charts. 
Scientific  Books. 

PART  IV -     -     - Pages  366  to  373 

Fire  Brick,  Tile  and  Fire  Clay  Material. 

PART  V—  Pages  374  to  411 

Chemicals  and  Reagents. 

PART  VI— See  Special  Catalogue. 

Physical  Apparatus. 


The  DENVER  FIRE  CLAY  CO. 

Illustrated  and  Priced  Catalogue 


104 


101-102 


103 


No. 

101  Acidometer,    Twitchell's,    for    determining    the    strength    of    all    kinds    of 

vinegar.    Directions  with  each  instrument $12.00 

102  Acidometer,  Twitchell's,  for  wine,  with  directions 12.00 

103  Acid  Pumps,  for  drawing  acids  or  other  liquids  from  carboys,  very  substan- 

tial and  effective,  for  factory  use 12.00 

104  Acid  Pumps,  latest  form,  for  laboratory  use 4.50 

Foot  Blower,  to  operate  the  same 4.00 

104a     Acid  Pump,  improved  form,  simple  and  effective 6.00 

105  Air  Tester,  Wolpert's,  latest  construction,  pocket  instrument,  for  determin- 

ing Carbonic  Acid  in  school  rooms,  factories,  mines,  etc 4-00 

106  Alembic  Salleron,  or  Monitor  Still,  for  determining  the  alcoholic  percentage 

in  spirituous  liquids,  made  of  copper,  see  Fig.  2021,  complete  in  box. .     10.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


107 


HENDRYX   17-INCH   COMBINATION   AGITATOR   AND   FILTER. 

No.  107.  We  have  placed  a  large  number  of  this  size  machine  in  mills,  universities 
and  testing  plants. 

With  this  machine,  tests  can  be  made  to  determine  how  fine  an  ore  must  be  ground 
in  order  to  get  the  best  extraction,  the  time  necessary  for  extraction,  the  rate  of  nitra- 
tion, the  effect  of  different  strength  of  solutions  and  other  important  data.  Your  labora- 
tory or  mill  is  not  complete  without  one  of  these  machines,  because  it  will  aid  you  in 
determinations  for  increased  recoveries.  The  capacity  of  this  machine  is  25  Ibs.  of  ore 
and  50  Ibs.  of  solution  to  a  charge. 

Shipping  weight  100  Ibs. 

Price  without  motor  $125.00  Net 

We  also  make  a  32-inch  diameter  Combination  Agitator  and  Filter  which  treats  300 
Ibs.  of  ore  and  600  Ibs.  of  solution  to  a  charge. 

Weight  complete  1,000  Ibs. 

Price  .  .  $300.00  Net 


THE  DENVER  FIRE  CLAY  COMPANY. 


108 


109 


HENDRYX  17-INCH   AGITATOR. 

No.  108.     This  is  the  most  ideal  agitator  for  the  purpose  of  making  cyanide  tests. 
The  capacity  is  20  Ibs.  of  ore  and  40  Ibs.  of  solution  to  the  charge.     It  is  provided  with  a 
coil  of  pipe  so  that  the  solution  may  be  heated  with  steam  or  hot  water  if  desired. 
Shipping  weight  90  Ibs. 

Machine  Complete  $80.00  Net 

Motor  Approximately   25.00  Net 

We  also  furnish  a  32-inch  diameter  agitator  for  testing  purposes  which  has  a  ca- 
pacity of  300  Ibs.  of  ore  and  600  Ibs.  of  solution. 
Shipping  weight  700  Ibs. 

Price   .   $200.00 


HENDRYX   16-INCH   CLAY   AGITATOR. 

No.  109.  This  agitator  is  the  same  as  the  17-inch  machine  except  that  all  of  the 
parts  exposed  to  the  solution  are  made  of  wood  or  vitrified  clay  so  that  tests  in  agitation 
may  be  made  using  acid  or  alkaline  solutions. 

This  is  an  excellent  apparatus  for  the  testing  of  oxidized  copper  ores  with  acids. 
The  capacity  is  20  Ibs.  of  ore  and  40  Ibs.  of  solution  to  a  charge. 

Shipping  weight  100  Ibs. 

Price  .  .  $100.00  Net 


THE  DENVER  FIRE  CLAY  COMPANY. 


in 


112 


113 


119 


120 


121 


123 


124 


No. 

111  Alkalimeter,  Bunsen's    , $1.00 

112  Alkalimeter,  Fresenius'     .60 

113  Alkalimeter,  Fresenius  &  Will's   45 

114  Alkalimeter,  Fritsche's,  for  minerals 50 

115  Alkalimeter,  Geissler's,  with  ground  joints  1.40 

116  Alkalimeter,  Geissler's,  with  stopcock    2.00 

117  Alkalimeter,  Geissler  &  Erdmann's   1.50 

117a     Alkalimeter,  Geissler's,  improved  form,  for  one  acid 1.75 

117b     Alkalimeter,  Geissler's,  improved  form,  for  two  acids  2.00 

118  Alkalimeter,  Kipp's,  with  stopcock 1.80 

119  Alkalimeter,  Mohr's,  with  pinchcock  .75 

120  Alkalimeter,  Mohr's,  for  carbonic  acid  determinations  1,00 

121  Alkalimeter,  Mohr's,  with  stopcock  2.50 

122  Alkalimeter,  Rohrbeck's,  with  stopcock  1.80 

123  Alkalimeter,  Schroedter's,  with  stopcock   1.80 

124  Alkalimeter,  Schaffner's,  on  foot    .60 


THE  DENVER  FIRE  CLAY  COMPANY. 


•ma 

130— No.  3111 


130— No.  3131 


130— No.  3139 


No. 

130      Anemometers  or  Air  Meters,  for  the  measurement  of  air  currents  through 

mines,  tunnels,  sewers,  etc.,  and  the  ventilation  of  hospitals,  schools, 

public  buildings,  etc. 


No. 
3111 

3131 
3132 
3139 


Portable  Air  Meter,  6  dials,  reading  to  10,000,000  feet $30.00 

Sand  Glass  timers  attached,  extra 3.75 

Biram's,  4  inches,  2  dials,  reading  to  1,000  feet 25,00 

Biram's,  4  inches,  4  dials,  reading  to  100,000  feet 28.00 

Biram's,  pocket  size,  2  dials,  reading  to  1,000  feet 40.00 

All  the  above  are  complete  in  case? 


THE  DENVER  FIRE  CLAY  COMPANY. 


131 


135 


141 


142 


143 


No. 

131       Annealing    Cups— DENVER    FIRE    CLAY   COMPANY'S   own   make;    made   of   se- 
lected clay;  the  finest,  whitest  Annealing  Cup  made. 

Largely  used  for  silica  fusions. 


134 

135 
136 

141 

142 
143 


No.  0 
Size 

Doz.  $1.00 

132  Annealing  Cup  Covers.     Doz.         .25 

133  Annealing  Cups,  Battersea, 

No.  A 

Dia.  iy8 


1 1/2x1  y2  in. 


1.00 


.25 


B 


1.00 


.25 


C 

11/2  in. 


Doz. 


$1.05 


1.05 


1.05 


.30 


Annealing  Cup  Covers.     Doz.         .30  .30 

Annealing  Cups,  Porcelain.     See  Crucibles,  Nos.  716  and  718. 

Annealing  Cup  Trays,  of  fire  clay:  very  convenient  for  handling  Annealing 
Cups  while  in  muffles  $0.75 

Annealing  Cup  Trays,  of  tinned  iron,  with  detachable  wood  handle,  made  to 
hold  12  Porcelain  Cups,  of  either  R.  B.  No.  0  or  00,  Cat.  No.  716,  or  R.  M. 
No.  7,  Cat.  No.  718;  can  be  made  to  order  for  other  sizes 1.25 

Anvil,  Plattner's,  l^xl  1/2  in.,  for  blow  pipe  work;  polished  steel .50 

Anvil,  for  Lead  Buttons,  6x6  in.,  planed  on  one  side •.  .  .  .       1.25 

Anvil,  square,  solid  steel,  mirror  polished  face. 


Size 
Each 


21/2 


3  in.  sq. 


$1.30 


1.70 


2.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


144 


145 


No. 

144 


145 


151 


Anvil,  square,  with  point,  solid  steel,  mirror  polished  face. 

Weight  1  2  3  .  4  6  Ibs. 

Face  iy2  l7/8  2%  2%  3  in.  sq. 


Each 


$0.75 


1.25 


1.75 


Anvil,  regular  shape,  steel  face,  for  use  on  table. 
Weight  5  10  15 

Face  4  5  5V2 


2.50 


20 
6% 


3.50 


30 

7 


50  Ibs. 
8V2  in. 


Bach 


$2.20 


2.75 


3.25 


4.00 


4.75 


6.25 


Asbestos    Board,  fire  and  acid  proof,  in  sheets  40x40  in.  from   1-16  to   ^ 

in.   thick    Ib.     $0.15 

In  full  sheets   Ib.        .10 

Approximate  weight  per  sheet  40x40  in.: 

Thickness  1-16  %  3-16  %  %  Vz  in. 


151a 


152 


153 

154 

155 
156 
156a 

157 


Weight  about 

4                 8 

12              15             25             30  Ibs. 

Asbestos  Board,  cut  in  squares 
Size                   4x4 

3,  1-16  in.  thick 

5x5 

6x6  in. 

Dozen              $0.20 

.30 

.40 

Asbestos  Cloth,  unaffected  by 

acids,  fire,  etc 

Size                  Fine 

Medium 

Heavy 

1  sq.  ft.             3y3 
Width              36 

4% 
36 

9oz. 
36  in. 

Yard               $4.00 

5.00 

7.00 

Asbestos  Cord,  in  1  Ib.  balls, 
cibles.  etc..  in  contact  with 

valuable  for 
fire.     Dia.  % 

suspending  metals,  retorts,  cru- 
in...                                           ..Ib.       1.50 

Asbestos  Fibre,  see  Chemical  list. 
Asbestos  Mittens,  see  Gloves. 

Asbestos   Paper,  of  pure,  white,  long  fibred  asbestos,  36  in.  wide,  1  yard 

weighing  1  Ib R>. 

In  10  Ib.  lots   Ib. 

Asbestos  Wick  Packing,  in  1  Ib.  balls Ib. 

Asbestos  Twine,  in  1  Ib.  balls,  dia.  1-16  in Ib. 

Asbestos  Sewing  Twine,  for  sewing  asbestos  cloth,  etc.,  in  1  Ib.  balls.  . .  .Ib. 

Asbestos  Tubes,  %  in.  outside, 
Length  9 

Each  $-9.06  .08  .10  .12 


.15 

.12 

.45 
1.75 
2.25 


in.  inside  diameter. 
10  12 


15  in. 


8 


THE  DENVER  FIRE  CLAY  COMPANY. 


No. 

158 


159 


160 


161 


158 


160 


Asbestos  Pads,  for  protecting  the  table  during  blowpipe  and  other  opera- 
tions. They  are  made  from  Asbestos  board  about  one-fourth  of  an  inch 
thick,  and  edged  with  iron.  They  are  incombustible,  and  excellent  non- 
conductors of  heat.  The  advantages  to  be  derived  by  their  use  during 
blowpipe  work  are  too  obvious  to  need  further  explanation. 

Prices : 

Size,  4  in.  x  4  in.  x 
Size,  8  in.  x  8  in.  x 
Size,  Gy2  in.  xlO  in.x 
Size,  10  in.  x  13  in.  x 
Size,  13  in.  x  20  in.  x 

Aspirators,  of  zinc,  japanned,  single  reservoir,  capacity  10  litres $  6.00 

Capacity  20  litres  9.00 

Aspirators,  of  zinc,  japanned,  double  reservoir  to  be  reversed,  for  continuous 

suction.     Capacity  10  litres  10.00 

Capacity  20  litres  15.00 

Aspirators,  of  zinc,  japanned,  revolving  for  continuous  suction  without 
change  of  connecting  tube.  Capacity  10  litres : . . .  25.00 


in  

$0.15 

in  

40 

in  

50 

in  

.85 

in... 

1.50 

THE  DENVER  FIRE  CLAY  COMPANY. 


Concerning  the  Selection  of  a  Balance 

of  Precision 

The  highest  quality  in  a  balance,  and  the  most  difficult  one  to  obtain,  is  a  beam  with 
great  stability  of  poise  and  extreme  sensibility.  These  two  conditions  are  in  exact  op- 
position to  each  other.  A  low  center  of  gravity  causes  stability  and  gives  to  the  beam  or 
pointer  a  strong  tendency  toward  the  zero  point.  For  example,  take  a  beam  with  a  very 
low  center  of  gravity;  it  has  a  quick  oscillation  and  is  very  stable.  It  will  not  be  notice- 
ably affected  by  outside  influences  such  as  electrical  currents,  vibrations,  changes  in  tem- 
perature, etc.  Such  a  balance  will  be  very  accurate  within  its  sensibility,  but  by  reason 
of  its  low  center  of  gravity  it  will  not  be  perceptibly  affected  by  a  very  light  weight.  In 
other  words,  it  will  be  rapid  and  stable,  but  not  sensitive. 

Take  the  opposite  of  this  condition.  For  example,  say  a  beam  in  which  the  point  of 
suspension  and  the  center  of  gravity  exactly  coincide.  With  such  a  beam  there  would  be 
no  zero  point.  Theoretically,  such  a  beam  would  remain  in  any  position  in  which  it 
might  be  placed  and  even  the  most  minute  weight  suspended  from  either  end  of  the  beam 
would  depress  that  end  to  the  extreme  limit  of  travel,  but  in  practice  outside  influences 
and  atmospheric  conditions  would  keep  it  in  almost  constant  motion  and  their  effect 
would  be  so  great  as  to  entirely  dominate. 

It  follows  that  outside  influences  must  be  overcome.  The  only  way  this  can  be 
accomplished  is  to  have  the  center  of  gravity  sufficiently  below  the  center  knife  edge  to 
give  the  necessary  stability  of  poise. 

The  weight  of  the  beam  also  has  an  important  bearing  on  the  position  of  the  center 
of  gravity.  The  lighter  the  beam  the  lower  may  be  the  center  of  gravity  for  a  given 
sensibility. 

It  is  a  simple  matter  to  lower  the  center  of  gravity  in  a  balance  beam,  but  in  order 
not  to  sacrifice  the  sensibility,  friction  must  be  reduced  to  the  minimum,  which  means 
knife  edges  perfectly  ground,  polished  and  adjusted. 

A  beam  with  imperfect  knife  edges  may  be  adjusted  to  a  high  sensibility  by  raising 
the  center  of  gravity,  but  such  a  balance  would  be  practically  devoid  of  any  stability; 
its  oscillations  would  be  very  slow  and  the  weighings  made  on  it  would  vary  more  at 
different  times  than  if  the  sensibility  were  less  and  the  stability  greater. 

The  center  of  gravity  in  any  balance  must  be  low  enough  to  give  stability  regardless 
of  the  condition  of  the  knife  edges.  This  is  imperative  in  order  to  get  uniform  results  in 
the  weighing. 

The  sensibility  to  which  a  balance  may  be  safely  adjusted,  therefore,  depends  upon 
the  degree  of  accuracy  with  which  the  knife  edges  have  been  ground,  polished  and  ad- 
justed. 

The  fault  with  many  of  the  cheap  balances  on  the  market  to-day  is  not  that  they  lack 
sensibility,  but  that  they  lack  stability  of  poise. 

It  is  a  very  common  error  among  assayers  to  neglect  testing  for  stability  when  select- 
ing a  fine  balance.  They  demand  a  high  sensibility  only,  and  the  balance  that  shows 
the  greatest  deviation  of  the  pointer  for  a  given  weight  is  selected  regardless  of  whether 
or  not  it  will  remain  in  balance  any  length  of  time. 

In  the  production  of  a  balance  with  poorly  ground  knife  edges  and  not  adjusted  prop- 
erly no  care  or  skill  is  required,  as  the  center  of  gravity  may  be  quickly  raised  to  com- 
pensate for  any  friction  caused  by  imperfection  iri  the  grinding  or  adjusting  of  the  knife 
edges,  and  a  test  for  sensibility  only  will  give  the  erroneous  impression  that  it  is  a  very 
fine  instrument. 


10  THE  DENVER  FIRE  CLAY  COMPANY. 


195 

NO.  OB  KELLER  ASSAY  BALANCE. 
5-inch  Beam.  Sensitive  to  1-500  Mg. 

No. 

195  For  scientific  laboratories,  control  and  umpire  assays.  Although  great  sensibility 
reduces  the  speed,  this  balance  will  handle  a  large  volume  of  work  rapidly  and 
economically. 

Construction. 

This  type  of  construction  permits  of  a  much  smaller,  neater  and  more  compact 
and  stronger  case,  decreasing  the  unnecessary  air  space  which  tends  to  produce 
air  waves,  thereby  greatly  affecting  the  accuracy  of  a  balance.  No  unnecessary 
parts  have  been  added  for  effect.  All  brass  work  is  gold  plated. 

Pointer. 

Is  upright  and  deviates  five  divisions  on  1-10  Mg.  on  scale  divided  into  twenty 
equal  parts  to  the  inch.  It  takes  seventeen  seconds  for  a  complete  oscillation. 

Beam. 

The  beam  is  of  the  truss  type,  which  gives  it  great  strength  and  rigidity,  with 
extreme  lightness.  The  edges  of  this  beam  are  so  accurately  adjusted  that  the 
sensibility  will  not  vary  whether  loaded  with  1  Mg.  or  two  grammes.  The  length 
of  beam  is  five  inches  between  the  outside  edges  and  carries  two  grammes  in  each 
pan.  There  are  no  graduations  on  this  beam  to  warp  or  weaken  it.  The  scale 
is  on  a  snow  white  base  inlaid  with  black  lines.  In  front  of  same  is  a  black 
pointer  attached  to  the  rider  operating  device.  This  pointer  indicates  the  rider 
on  the  beam.  The  rider  carrier  has  a  fixed  place  for  a  rider  to  hang.  With 
this  carrier  the  rider  is  placed  on  the  beam  and  released  from  the  carrier  with- 
out moving  the  pointer  in  front  of  the  scale,  by  simply  pressing  the  center  but- 
ton of  the  outside  knob.  The  accuracy  of  this  arrangement  cannot  be  disputed 
if  our  method  of  poising  the  beam  is  followed. 

Beam  Support. 

Fall-away  type,  making  the  release  of  beam  smooth  and  gradual;  no  sudden  jar  or 
jerks.  This  support  is  operated  by  a  lever.  This  lever  is  a  new  and  important 
feature,  and  it  gives  the  support  a  smoother  action.  Its  bearing  upon  the 
eccentric  is  of  hardened  steel  and  everlasting.  The  support  may  be  removed 
for  cleaning  and  replaced  without  losing  the  adjustment. 

Hangers  and  Pans. 

Hangers  and  Pans  are  made  of  German  Silver  and  are  interchangeable. 

Price $300.00  Net 


THE  DENVER  FIRE  CLAY  COMPANY. 


11 


196 


NO.  2B  KELLER  ASSAY  BALANCE. 


5-inch  Beam. 


No. 

196 


Sensitive  to  1-300  Mg. 


A  high-grade  balance  at  a  moderate  price.    Especially  adapted  for  schools,  colleges, 
scientific  laboratories,  assayers  and  all  who  want  an  accurate  and  absolutely 
reliable  instrument  at  a  moderate  price. 
Construction. 

Non -column  type;   simple  in  construction;   nothing  to  get  out  of  order;   all  brass 

work  gold  plated. 
Pointer. 

Is  upright  and  deviates  three  divisions  on  1-10  Mg.  on  scale  divided  into  twenty 

equal  parts  to  the  inch.     It  takes  fourteen  seconds  for  a  complete  oscillation. 
Beam. 

The  peculiar  construction  of  beam  gives  it  great  strength  and  rigidity.     The  edges 
and  bearings  are  so  accurately  adjusted  that  the  sensibility  will  not  vary  whether 
loaded  with  one  Mg.  or  two  grams.    The  length  of  beam  is  five  inches  between 
the  outside  edges  and  carries  two  grams  in  each  pan. 
Beam  Support. 

Fall  away  type,  making  the  release  of  the  beam  smooth  and  gradual;  no  sudden 
jar  or  jerks.  This  support  is  operated  by  a  lever.  This  lever  is  a  new  and  im- 
portant feature  and  it  gives  the  support  a  smoother  action.  Its  bearing  upon  the 
eccentric  is  of  hardened  steel  and  everlasting.  The  support  may  be  removed 
for  cleaning  and  replaced  without  losing  the  adjustment. 
Hangers  and  Pans. 

Hangers  and  Pans  are  made  of  German  Silver  and  are  interchangeable.     The  pans 
have  a  durable  dead  black  lining.     The  most  minute  particle  can  easily  be  seen. 
Stirrups  of  the  Hangers. 

The  bearings  are  flat  agate  which  hang  free  on  a  knife  edge,  doing  away  with  all 
liability  of  friction.     They  are  supported  when  not  in  use. 

This  balance  as  well  as  all  other  Keller  balances  will  work  satisfactorily  on  any 
temporary  bench  and  is  not  affected  by  ordinary  vibrations. 

Price  .  .   $200.00  Net 


12 


THE  DENVER  FIRE  CLAY  COMPANY. 


197 


NO.  3B   KELLER  ASSAY   BALANCE. 


5-inch  Beam. 


No. 
197 


Sensitive  to  1-200  Mg. 


A  high-grade  balance  at  a  moderate  price.    Especially  adapted  for  schools,  colleges, 
scientific  laboratories,  assayers  and  all  who  want  an  accurate  and  absolutely 
reliable  instrument  at  a  moderate  price. 
Construction. 

Non-column  type;   simple  in  construction;   nothing  to  get  out  of  order;   all  brass 

work  gold  plated. 
Pointer. 

Is  upright  and  deviates  two  divisions  on  1-10  Mg.  on  scale  divided  into  twenty 

equal  parts  to  the  inch.     It  takes  eleven  seconds  for  a  complete  oscillation. 
Beam. 

The  peculiar  construction  of  beam  gives  it  great  strength  and  rigidity.     The  edges 
and  bearings  are  so  accurately  adjusted  that  the  sensibility  will  not  vary  whether 
loaded  with  one  Mg.  or  two  grammes.     The  length  of  beam  is  five  inches  be- 
tween the  outside  edges  and  carries  two  grammes  in  each  pan. 
Beam  Support. 

Fall  away  type,  making  the  release  of  the  beam  smooth  and  gradual;  no  sudden 
jar  or  jerks.  This  support  is  operated  by  a  lever.  This  lever  is  a  new  and  im- 
portant feature  and  it  gives  the  support  a  smoother  action.  Its  bearing  upon  the 
eccentric  is  of  hardened  steel  and  everlasting.  The  support  may  be  removed  for 
cleaning  and  replaced  without  losing  the  adjustment. 
Hangers  and  Pans. 

Hangers  and  Pans  are  made  of  German  Silver  and  are  interchangeable.     The  pans 
have  a  durable  dead  black  lining.     The  most  minute  particle  can  easily  be  seen. 
Stirrups  of  the  Hangers. 

The  bearings  are  "V"  grooved,  which  are  carefully  fitted  to  the  knife  edges. 

This  balance  as  well  as  all  other  Keller  balances  will  work  .satisfactorily  on  any 
temporary  bench  and  is  not  affected  by  ordinary  vibrations. 

Price  .  $150.00  Net 


THE  DENVER  FIRE  CLAY  COMPANY.  13 


198 
NO.  14  KELLER  ASSAY   BALANCE. 

5-inch   Beam.  Sensitive  to  1-100  Mg. 

No.  198. 

Case. 

Rectangular  Polished  Mahogany  as  nearly  dust  proof  as  can  be  made  with  counter- 
poised doors,  black  plate-glass  sub-base  covering  entire  top  of  base  with  two 
drawers  underneath,  as  shown  in  cut,  with  adjusting  screws  and  levels  that  will 
not  get  out  of  order. 

Construction. 

Non-column  type.  This  type  of  construction  permits  of  a  much  smaller  and  better 
case,  decreasing  the  unnecessary  air  space  which  tends  to  produce  air  waves, 
thereby  greatly  affecting  the  accuracy  of  a  balance. 

Hangers. 

Hangers  and  Pans  are  made  of  German  Silver  and  are  interchangeable.  The  pans 
have  a  durable  dead  black  lining.  The  most  minute  particle  is  easily  seen. 

Beam. 

Carries  two  grams  in  each  pan,  takes  nine  seconds  for  a  complete  oscillation  and 
is  non-magnetic.  The  pointer  deviates  one  division,  on  1-10  Mg.,  on  the  scale 
divided  into  twenty  equal  parts  to  the  inch.  One  arm  of  the  beam  is  divided 
into  eleven  tenths.  The  first  tenth  on  the  beam  is  undivided  and  is  marked 
zero.  The  other  tenths  are  divided  into  five  equal  parts  each;  in  all  the  scale 
has  fifty  divisions  on  one  arm.  The  divisions  are  very  plain  and  can  be  easily 
read  without  the  aid  of  a  magnifying  glass.  Length  of  the  beam  is  five  inches 
between  the  outside  edges.  In  poising  the  balance  the  rider  should  be  placed 
at  zero,  then  poised  with  one  of  the  star  wheels.  Edges  and  bearings  are  agate 
accurately  ground  and  adjusted  with  great  skill  and  infinite  patience.  All  brass 
work  is  gold  plated.  This  balance  as  well  as  all  other  Keller  balances  will  work 
satisfactorily  on  any  temporary  bench  and  is  not  affected  by  vibrations. 

Pan  Arrests. 

Fall  away  type  which  will  not  get  out  of  order. 

Price  .  .  $150.00  Net 


14 


THE  DENVER  FIRE  CLAY  COMPANY. 


199 


AINSWORTH'S  INVERTED  TYPE  V  BALANCE. 


5-inch  Beam. 


Sensibility  1-200  to  1-500  Nig." 


Code  Word,  Apex. 


No. 

199  The  Rider  Carrier  is  of  improved  design  with  no  metal  surfaces  in  sliding  contact, 
and  will  operate  smoothly  and  without  lubrication  under  all  conditions.  The 
graduated  scales,  divided  into  hundredths, — each  division  representing  1-100 
the  weight  of  the  rider  used, — are  attached  to  the  carrier. 

Simplicity.  This  balance  has  been  designed  with  the  fewest  possible  parts,  thus 
limiting  the  liability  to  derangement,  a  feature  that  will  be  appreciated  by  as- 
sayers  at  a  great  distance  from  the  factory. 

Dimensions  of  case,  17  x  17  x  10  inches.     Packed,  25  x  21  x  15  inches. 

Weight,  net  20  pounds,  packed  50  pounds,  packed  in  zinc  lined  case  for  export 
60  pounds.  • 

Price   $300.00 

*At  a  rated  sensibility  of  1-200  milligramme  the  pointer  or  indicator  of  this  balance 
deviates  five  divisions  of  one  millimeter  each  on  the  scale  or  index  for  1-10  milligramme. 
Greater  sensibility  is  not  recommended  for  commercial  work. 


THE  DENVER  FIRE  CLAY  COMPANY. 


15 


200 


DENVER   FIRE  CLAY  COMPANY'S  SPECIAL   BUTTON   BALANCE   NO.  1. 


5-inch — 12.7  Cm.  Beam. 


Sensibility  1-200  (.005)   Mg. 


1-13000  Gr. 


Made  specially  for  the  Denver  Fire  Clay  Company  by  Wm.  Ainsworth  &  Sons. 


No. 

200      For  particularly  accurate  weighings,  such  as  control  and  umpire  assays. 

The  beam  is  of  brass,  straight  on  top,  and  with  50  divisions  each  side  of  the  center, 
reading  to  1-50  milligramme  with  a  1  milligramme  rider,  or  to  1-100  milligramme 
with  a  Vz  milligramme  rider.  Finer  readings  may  be  taken  by  sub-division  with 
the  eye,  an  especially  ground  reading  lens  being  provided.  The  beam  is  un- 
obstructed on  top,  and  a  rider  may  be  placed  anywhere  from  0  at  the  center  to 
the  last  division  at  either  end,  which  is  directly  over  the  end  edge  and  repre- 
sents the  full  weight  of  the  rider  used. 

The  edges  and  bearings  are  of  agate,  has  fall-away  pan  rests,  improved  base, 
plate-glass  sub-base  covering  the  entire  base,  and  skeleton  hangers.  The  rider 
apparatus  is  of  improved  design,  and  so  constructed  that  there  are  no  metal 
surfaces  in  contact  with  one  another.  It  always  works  smoothly  and  it  is  never 
necessary  to  use  a  lubricant. 

The  case  is  of  French  polished  mahogany  with  counterpoised  sliding  doors. 
Dimensions,  20  x  17  x  10  inches. 

In  the  cut  the  counterpoised  door  has  been  removed  to  better  illustrate  the  bal- 
ance. 

Weight,  net,  20  pounds.     Packed,  50  pounds. 
Price   .   $275.00 


16 


THE  DENVER  FIRE  CLAY  COMPANY. 


.  -. 


AINSWORTH'S  TYPE  C  PRECISION  BUTTON  BALANCE. 


5-inch— 12.7  Cm. 


N 


Sensibility  1-500  (j002)  Mg. 


1-32000  Gr. 


201  For  particularly  accurate  weighings,  such  as  control  and  umpire  assays,  and  for 
scientific  laboratories  where  the  utmost  accuracy  is  required. 

We  can  also  recommend  this  balance  for  the  rapid  fc«i»«ni»g  of  a  huge  volume  of 
particularly  accurate  work  when  adjusted  to  a  sensibility  of  about  1-200  mg. — 
1-13000  grain. 

The  beam  is  of  a  special  alloy,  unobstructed  on  top,  so  that  the  rider  may  be 
placed  at  any  point,  and  has  50  divisions  each  side  of  the  center,  each  division 
representing  1-50  milligramme,  with  a  1  milligramme  rider  or  1-100  with  a  U 
milligramme  rider.  Has  improved  star  wheel  adjustment,  and  cyHndrically 
ground  glass  for  reading  divisions. 

All  edges  and  bearings  are  of  specially  selected  agate  accurately  ground  and 
polished  by  improved  machinery. 

Has  fall-away  pan-rests  and  skeleton  hangers  of  hard  drawn  German  Silver  wire. 

The  rider  apparatus  is  of  improved  design,  and  so  constructed  that  there  are  no 
metal  surfaces  in  contact  with  one  another.  It  always  works  smoothly  and  it 
hi  never  necessary  to  use  a  lubricant.  The  base  is  of  imumned  derign  and  con- 
tains center  rod  and  pan  rest  bearings.  This  construction  umuim  the  align- 
ment of  the  working  parts,  regardless  of  any  warping  of  the  case,  and  the 
entire  mechanism  can  be  taken  out  for  cleaning  by  removing  three  screws. 

AD  metal  work  is  gold  plated.  A  plate-glass  sub-base  covers  the  entire  top  of 
base  and  the  case  is  of  thoroughly  seasoned  mahogany  throughout  and  as  nearly 
dust  proof  as  it  can  be  made. 

In  the  engraving  the  counterpoised  sliding  door  has  been  icmovcd  to  better  illus- 
trate the  balance. 

Dimensions.  20x17x10  inches— 50 x 43 x 25  centimeters. 

Weight,  net,  24  pounds— 11  kilos.  Packed.  50  pounds—  ±£5  kilos.  Packed  in  zine- 
lined  case  for  export,  CO  pounds— 28  kflos.  Dimensions.  27x21x15  inches — 

Price  .  .   $300.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


17 


202 


THOMPSON'S    NO.   5    BUTTON    BALANCE. 


No. 
202 


5-inch  Beam. 


Sensibility  1-500  Mg. 


We  believe  this  balance  to  be  superior  to  any  of  its  type.  It  is  designed  and  built 
for  the  most  delicate  assaying,  and  has  advantages  never  before  brought  out  in 
points  of  durability  and  extreme  accuracy.  It  is  of  the  non-column  type,  with 
upright  pointer.  This  principle  of  construction  gives  plenty  of  room  for  a  long 
pointer,  plainly  indicating  the  slightest  movement  of  the  beam  and  greatly  re- 
ducing the  length  and  weight  of  hangers,  thereby  tending  to  concentrate  the 
movable  mass  near  its  central  axis,  and  so  creating  the  greatest  possible  stabil- 
ity of  poise  with  the  least  possible  resistance  to  the  most  minute  load  in  the  pan. 

The  scientific  construction  of  the  beam  will  appeal  to  the  engineer.  It  is  of  the 
truss  type  and  is  so  constructed  that  all  trusses  are  in  tension,  the  lower  chord 
alone  being  in  compression. 

Special  attention  is  called  to  the  fact  that  the  graduations  are  on  the  beam.  In 
this  balance  we  use  an  etching  process,  which  in  no  way  affects  the  density  of 
the  metal,  and  the  readings  being  taken  direct  from  the  position  of  the  rider  on 
the  beam,  there  is  no  possibility  of  error  through  any  difference  between  the 
relative  position  of  the  rider  and  the  graduations. 

The  agate  edges  and  bearings  are  of  the  finest  quality  and  workmanship,  and  in 
this  balance  we  spare  no  time  or  expense  in  bringing  the  various  adjustments 
to  the  highest  point  of  perfection. 

The  rider  apparatus,  having  fine  felt  bearings  in  contact  with  polished  metal  sur- 
faces, gives  a  smooth  and  noiseless  action,  and  is  very  sensitive  to  the  touch. 

The  balance  has  a  star  wheel  balancing  device,  skeleton  hangers,  fall-away  pan 
rests,  rider-rod  locks,  levels  and  leveling  screws.  The  beam  and  index  are  pro- 
vided with  special  ground  cylindrical  reading  glasses,  and  all  exposed  metal 
parts  are  gold  plated. 

The  case  is  of  mahogany,  thoroughly  seasoned  and  finely  polished,  and  has  counter- 
poised door.  A  black  glass-plate  extends  over  the  entire  base. 

Dimensions  of  case  are  16%  x  17  x  10  inches. 


Price,  as  illustrated  and  described $350.00 

Price,  without  multiple  rider  attachment 325.00 

Price,  without  reading  glass  for  beam  and  without  attachment 310.00 


18 


THE  DENVER  FIRE  CLAY  COMPANY. 


203 


TROEMNER'S  SPECIAL  NO.  04  ASSAY   BALANCE. 


No. 

203 


Gold  plated,  4-inch  beam.  Sensibility  1-500  milligramme.  This  balance  is  espe- 
cially designed  for  control  and  umpire  assay  and  for  the  rapid  handling  of  all 
particularly  accurate  work,  and  for  all  scientific  investigations  where  the  high- 
est attainable  sensibility  is  required.  The  beam  is  4  inches  long,  made  of  a 
special  alloy,  and  oxidized  black;  the  divisions  are  white,  making  it  clear  and 
easy  to  read.  It  has  100  full  divisions  each  side  of  center  knife  and  is  provided 
with  a  specially  ground  reading  glass.  The  rider  carriage,  which  is  operated 
from  the  right  side,  has  full  clear  sweep.  Has  fall-away  beam  and  pan  rests, 
releasing  the  beam  and  pans  without  any  jerk  or  kick.  All  bearings  and  edges 
are  of  agate.  New  improved  arrangement  for  balancing  beam  rapidly  and  of 
extreme  sensitiveness.  A  reading  glass  is  provided  for  the  ivory  index  and 
beam,  adjustable  at  any  angle,  or  can  be  dropped  entirely  out  of  the  way.  All 
the  metal  parts  of  the  balance  are  gold  plated.  The  case  is  of  the  finest  old 
mahogany,  finely  finished,  with  glass  sides,  top  and  back,  the  glass  sub-base  is 
of  black  plate-glass,  and  entirely  covers  the  top  of  case  base.  The  case  is  as 
nearly  dust  proof  as  it  is  possible  to  make  it,  and  is  of  the  following  dimensions: 
17  inches  high,  IG1/^  inches  wide,  9%  inches  deep. 


Price   $250.00 


THE  DENVER  FIRE  CLAY  COMPANY.  19 


204 

DENVER    BALANCE    COMPANY'S    BUTTON    BALANCE    STYLE    H. 

4-inch    Beam.  Sensitive   1-200—1-400   Mg. 

No. 

204  The  beam  is  similarly  constructed  on  either  side  of  line  of  edges  and  pointer,  in- 
suring strength  and  perfect  alignment  of  the  edges  during  variations  of  tempera- 
ture. The  graduations  are  on  a  separate  strip  of  Meteorite,  and  adjusted  to  the 
edges.  The  star-wheel  adjustment  is  placed  on  either  side  of  center  edge.  The 
beam-locking  device,  easily  operated  from  the  outside  of  case  and  found  so  very 
convenient  in  our  portable  styles,  is  applied  to  this  balance  also. 

The  advantages  of  it  are — convenience  in  transportation,  unnecessary  handling  of 
beam,  greater  safety  in  placing  hangers  and  operating  the  star-wheel  adjustment. 

The  rider  attachment  of  improved  design  will  always  work  smooth  and  easy  under 
all  conditions,  and  securely  locks  the  carriers  in  place  when  not  in  use.  A 
reliable  thermometer  set  in  the  column  supporting  the  index  will  be  found  a 
convenient  adjunct  to  the  balance.  The  working  parts  of  the  balance,  mounted 
on  a  heavy  plate-glass  base,  will  always  keep  in  perfect  alignment. 

The  balance,  although  not  classed  as  a  portable,  when  provided  with  a  leather- 
covered  carrying  case,  can  be  used  for  such  purpose. 

Price,  if  sensitive  to  1-200  mg $200.00 

Price,  if  sensitive  to  1-400  mg 225.00 

Carrying  case,  net   6.50 


20 


THE  DENVER  FIRE  CLAY  COMPANY. 


205 


AINSWORTH'S  TYPE  D  PRECISION  BUTTON   BALANCE. 


4-inch— 10  Cm.   Beam. 


Sensibility   1-400   (.0025)    Mg.— 1-26000  Gr. 


No. 

205  This  balance  is  similar  to  Type  C,  excepting  the  beam,  which  is  4  inches  long. 
While  not  quite  as  sensitive  as  Type  C,  it  is  more  rapid,  and  when  adjusted  to 
a  sensibility  of  1-200  milligramme  is  unequaled  for  rapidity. 

It  has  improved  rider  apparatus,  star-wheel  adjustment,  cylindrically  ground  read- 
ing glasses  for  beam  and  index,  skeleton  hangers,  improved  base,  agate  edges 
and  bearings,  fall-away  pan  rests,  etc. 

Case  of  French  polished  mahogany  with  extension  plate-glass  sub-base  covering 
entire  top  of  base. 

In  the  engraving  the  counterpoised  door  has  been  removed  to  better  illustrate  the 
balance. 

Dimensions,  20  x  17  x  10  inches — 50  x  43  x  25  centimeters. 

Weight,  net,  24  pounds — 11  kilos.  Packed,  50  pounds — 22.5  kilos.  Packed  in  zinc- 
lined  case  for  export,  60  pounds — 28  kilos.  Dimensions,  27  x  21  x  15  inches — 
68  x  53  x  38  centimeters. 


Price   ' $300.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


21 


206 


THOMPSON'S  BUTTON   BALANCE,  STYLE  NO.  6. 


4-inch   Beam. 


Sensibility  1-400  Mg. 


No. 

206 


We  recommend  this  balance  for  work  requiring  extreme  accuracy,  such  as  control 
and  umpire  assays. 

It  is  quick  and  positive  in  action,  and  has  a  stability  of  poise  that  will  insure 
uniform  and  reliable  results. 

Edges  and  bearings  are  of  selected  agate,  and  are  ground  and  polished  with  the 
greatest  possible  care. 

The  balance  has  improved  rider  apparatus,  star-wheel  balancing  device,  specially 
ground  reading  glasses  for  beam  and  index,  skeleton  hangers,  fall-away  pan 
rests,  rider-rod  lock,  levels  and  leveling  screws. 

Case  is  of  thoroughly  seasoned  mahogany  with  counterpoise  door.  It  is  finely  pol- 
ished and  has  a  black  glass  plate,  which  extends  over  the  entire  base. 

Dimensions,  16%  x  17  x  10  inches. 

Price,  as  illustrated  and  described $325.00 

Price,  without  Multiple  Rider  attachment 300.00 

THOMPSON'S  BUTTON   BALANCE,  STYLE  NO.  8. 

5-inch  Beam.  Sensibility  1-400  Mg. 

No. 
206a     Similar  to  Style  No.  6,  excepting  the  beam,  which  is  one  inch  longer,  and  of  the 

plain  construction  without  braces  or  pin  graduations. 

Dimensions,  20  x  17  x  10  inches. 

Price,  as  described  $290.00 

Price,  without  Multiple  Rider  attachment  265.00 


22 


THE  DENVER  FIRE  CLAY  COMPANY. 


207 


AINSWORTH'S  TYPE  A  BUTTON   BALANCE. 


5-inch — 12.7  Cm.  Beam. 


Sensibility  1-200  (.005)   Mg.— 1-13000  Gr. 


No. 

207       For  accurate  and  rapid  weighings,  and  used  by  many  assayers  having  a  large 
volume  of  work. 

The  beam  is  of  brass,  straight  on  top  and  with  50  divisions  each  side  of  the  center 
reading  to  1-50  milligramme  with  a  1  milligramme  rider,  or  to  1-100  milligramme 
with  a  Vz  milligramme  rider,  finer  readings  being  taken  by  subdividing  the  divi- 
sions with  the  eye,  a  specially  ground  reading  glass  being  provided.  The  beam 
is  unobstructed  on  top,  and  a  rider  may  be  placed  anywhere  from  0  at  the  center 
to  the  last  division  at  either  end,  which  is  directly  over  the  end  edge  and  repre- 
sents the  full  weight  of  the  rider  used. 

All  edges  and  bearings  are  of  agate.  Has  fall-away  pan  rests,  improved  base, 
rider  apparatus  and  releasing  mechanism,  plate-glass  sub-base,  and  skeleton 
hangers.  In  French  polished  mahogany  case  with  counterpoised  sliding  door. 

Dimensions,  20x17x10  inches — 50x43x25  centimeters. 

In  the  cut  the  counterpoised  door  has  been  removed  to  better  illustrate  the  balance. 

Weight,  net,  20  pounds  —  9.1  kilos.  Packed.  50  pounds  —  22.5  kilos.  Packed  for 
export  in  zinc-lined  case,  60  pounds — 28  kilos. 

Dimensions,  27  x  21  x  15  inches — 68  x  53  x  38  centimeters. 


Price   $250.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


23 


208 


THOMPSON'S  BUTTON   BALANCE,  STYLE  NO.  7. 


4-inch   Beam. 


No. 
208 


Sensibility  1-200  Mg. 


Has  agate  edges  and  bearings,  truss  beam  with  pin  graduations,  double  rider  at- 
tachment, fall-away  pan  rests,  star  wheel  balancing  device,  skeleton  hangers, 
rider  rod  locks,  reading  glasses  for  beam  and  index.  Mahogany  case  with  plate- 
glass  base,  levels  and  leveling  screws. 

Dimensions,  16 ^  x  17x10  inches. 

If  preferred  we  will  furnish  at  same  price  a  rectangular  reading  glass  for  beam 
instead  of  the  round  glass  shown  in  illustration. 

Price,  as  illustrated  and  described  $250.00 

Price,  with  Multiple  Rider  attachment  275.00 

f 

THOMPSON'S  BUTTON   BALANCE,  STYLE  NO.  9. 

4-inch  Beam.  Sensibility  1-200  Mg. 

No. 
208a     Same  in  all  respects  as  Style  No.  7,  except  that  this  style  has  no  magnifying  glass 

for   beam. 

Price,  as  illustrated  and  described  $235.00 

Price,  with  Multiple  Rider  attachment 260.00 

THOMPSON'S  BUTTON    BALANCE,  STYLE   NO.  10. 

4-inch   Beam.  Sensibility  1-200   Mg. 

No. 

208b     Same  in  all  respects  as  Style  No.  9,  excepting  the  beam,  which  is  of  plain  type, 
without  braces  or  pin  graduations. 

Price,  as  described  $200.00 

Price,  with  Multiple  Rider  attachment  225.00 


24 


THE  DENVER  FIRE  CLAY  COMPANY. 


209 


AINSWORTH'S   TYPE    E    BUTTON    BALANCE. 


5-inch — 12.7  Cm.  Beam. 


Sensibility  1-200  Mg— 1-13000  Gr. 


No. 

209 


This  balance  is  similar  in  all  respects  to  Type  A,  but  is  not  provided  with  reading 
glass  for  beam,  nor  improved  base. 

Has  all  latest  improvements,  including  improved  rider  apparatus,  star-wheel  ad- 
justment, skeleton  hangers,  plate-glass  sub-base,  agate  edges  and  bearings,  etc. 

Case  is  of  thoroughly  seasoned  mahogany,  with  counterpoised  sliding  door. 
Dimensions,  20  x  17  x  10  inches — 50  x  43  x  25  centimeters. 

In  the  engraving  the  counterpoised  sliding  door  has  been  removed  to  better  illus- 
trate the  balance. 

Weight,  net,  20  pounds  —  9.1    kilos.     Packed,  50  pounds  —  22.5  kilos.     Packed  for 
export  in  zinc-lined  case,  60  pounds — 28  kilos. 

Dimensions,  27  x  21  x  15  inches — 68  x  53  x  38  centimeters. 


Price   $225.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


25 


210 


AINSWORTH'S  TYPE  F  BUTTON  BALANCE. 


4-inch — 10  Cm.  Beam. 


Sensibility   1-200   (.005)    Mg.— 1-13000  Gr. 


No. 
210 


This  balance,  having  a  beam  but  four  inches  long,  is  very  rapid  and  has  all  the 
latest  improvements,  including  reading  glass  for  beam,  improved  rider  apparatus 
and  base,  fall-away  pan  rests,  plate-glass  sub-base,  skeleton  hangers. 

The  beam  has  50  divisions  each  side  of  the  center  reading  to  1-50  milligramme 
with  a  1  milligramme  rider  or  to  1-100  milligramme  with  a  Vz  milligramme  rider, 
finer  readings  being  taken  by  subdividing  the  divisions  with  the  eye.  It  is  un- 
obstructed on  the  top,  and  the  rider  can  be  placed  at  any  point  from  the  0  at  the 
center  to  the  last  division  at  either  end,  which  is  directly  over  the  end  edge  and 
represents  the  full  weight  of  the  rider  used.  All  edges  and  bearings  are  of  agate. 

Has  French  polished  mahogany  case  with  counterpoised  sliding  door,  all  of  thor- 
oughly seasoned  lumber. 

Dimensions,  20  x  17  x  10  inches — 50  x  43  x  25  centimeters. 

In  the  engraving  the  counterpoised  sliding  door  has  been  removed  to  better  illus- 
trate the  balance. 

Weight,  net,  20  pounds — 9.1  kilos.  Packed,  50  pounds — 22.5  kilos.  Packed  for 
export  in  zinc-lined  case,  60  pounds — 28  kilos. 

Dimensions,  27x21x15  inches — 68x53x38  centimeters. 

Price   .  .    $225.00 


AINSWORTH'S  TYPE  FA  BUTTON  BALANCE. 
No. 

210a     Similar  in  all  respects  to  Type  F,  except  that  it  has  no  reading  glass  for  beam. 

Price   $200.00 


26 


THE  DENVER  FIRE  CLAY  COMPANY. 


211 


THOMPSON'S   BUTTON    BALANCE,   STYLE    NO.    19. 
5-inch   Beam.  Sensibility   1-100   Mg. 

No. 

211       Has  agate  edges  and  bearings,  double-rider  attachment,  fall-away  pan  rests,  star 

adjustment,  skeleton  hangers,  levels  and  leveling  screws,  reading  glass  for  ivory 

index,  polished  mahogany  case  with  plate-glass  base. 

Dimensions,  20  x  17  x  10  inches. 

Price,  as  illustrated  and  described $165.00 

Price  with  Multiple  Rider  attachment 190.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


27 


No. 
212 


212 


AINSWORTH'S  TYPE   EA   BUTTON    BALANCE. 


5-inch — 12.7  Cm.  Beam. 


Sensibility  1-100  Mg.— 1-6500  Gr. 


Has  heavy  5-inch  beam  and  is  suitable  for  accurate  and  rapid  gold  and  silver  but- 
ton weighing. 

Has  all  latest  improvements,  including  fall-away  pan  rests,  agate  edges  and  bear- 
ings, skeleton  hangers,  double  rider  apparatus,  plate-glass  sub-base,  reading 
glass  for  index,  etc. 

Dimensions,  20  x  17  x  10  inches — 50  x  43  x  25  centimeters. 

In  the  engraving  the  sliding  door  has  been  removed  to  better  illustrate  the  balance. 

Weight,  net,  20  pounds — 9.1  kilos.  Packed,  50  pounds — 22.5  kilos.  Packed  for 
export  in  zinc-lined  case,  60  pounds — 28  kilos. 

Dimensions,  27  x  21  x  15  inches — 68  x  53  x  38  centimeters. 


Price   $160.00 


AINSWORTH'S  TYPE  FB  BUTTON  BALANCE. 

4-inch — 10  Cm.  Beam.  Sensibility  1-100  Mg. — 1-6500  Gr. 

No. 
212a     Similar  to  Type  EA,  except  in  length  of  beam. 

Price $160.00 


28 


THE  DENVER  FIRE  CLAY  COMPANY. 


213 


THOMPSON'S  BUTTON    BALANCE,  STYLE   NO.  20. 

6-inch   Beam.  Sensibility   1-100   Mg. 

No. 
213       Has  agate  edges  and  bearings,  double  rider  attachment,  plate-glass  base,  reading 

glass,  fall-away  pan  rests,  star  adjustment,  skeleton  hangers,  levels  and  leveling 

screws,  polished  mahogany  case  with  counterpoised  door. 
Dimensions,  20  x  17  x  10  inches. 

Price,  as  illustrated  and  described   $135.00 

Price,  with  Multiple  Rider  attachment   160.00 

THOMPSON'S  BUTTON  BALANCE,  STYLE  NO.  21. 

6-inch  Beam.  Sensibility  1-100  Mg. 

No. 
213a     Same  in  all  respects  as  style  No.  20,  except  that  it  has  no  plate-glass  base. 

Price,    as    described $125.00 

Price,  with  Multiple  Rider  attachment 150.00 

THOMPSON'S   BUTTON    BALANCE,   STYLE    NO.  22. 
6-inch   Beam.  Sensibility  1-50   Mg. 

No. 

213b     Same  as  style  No.  21,  except  that  it  has  single  rider  attachment  and  not  as  sen- 
sitive. 

Price,  as  described    $100. CO 

Price,  with  Multiple  Rider  attachment 125.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


29 


214 


AINSWORTH'S  TYPE  H  BUTTON  BALANCE. 


6-inch — 15.2  Cm.  Beam. 


Sensibility  1-100  (.01)  Mg.— 1-6500  Gr. 


No. 

214 


An  excellent  button  balance  for  ordinary  button  weighings  with  all  the  latest  im- 
provements, including  improved  rider  apparatus  and  fall-away  pan  rests.  Has 
agate  edges  and  bearings  and  star-wheel  adjustment. 

The  beam  has  50  divisions  each  side  of  the  center  reading  to  1-50  milligramme 
with  a  1  milligramme  rider,  or  to  1-100  milligramme  with  a  Vz  milligramme 
rider,  and  being  unobstructed  on  the  top  the  rider  may  be  placed  at  any  point 
from  0  at  the  center  to  the  last  division,  which  is  directly  over  the  end  edge  and 
represents  the  full  weight  of  the  rider  used. 

Has  French  polished  mahogany  case  of  thoroughly  seasoned  mahogany,  with  coun- 
terpoised sliding  door  and  plate-glass  sub-base. 

Dimensions,  20  x  17  x  10  inches — 50  x  43  x  25  centimeters. 

In  the  engraving  the  counterpoised  sliding  door  has  been  removed  to  better  illus- 
trate the  balance. 

Weight,  net,  20  pounds — 9.1  kilos.  Packed,  50  pounds — 22.5  kilos.  Packed  for 
export  in  zinc-lined  case,  60  pounds — 28  kilos. 

Dimensions,  27  x  21  x  15  inches — 68  x  53  x  38  centimeters. 

Price   .  $135.00 


AINSWORTH'S  TYPE  I  BUTTON  BALANCE. 


8-inch  Beam. 


Sensibility  1-100  Mg. 


No. 

214a     Similar  in  all  respects  to  Type  H,  only  a  little  slower  in  action,  owing  to  the 
difference  in  length  of  the  beam   (2  inches). 

Dimensions  of  case,  20  x  17  x  10  inches — 50  x  43  x  25  centimeters. 
Price   $125.00 


30 


THE  DENVER  FIRE  CLAY  COMPANY. 


No. 
215 


215 


AINSWORTH'3   TYPE   J    BUTTON    BALANCE. 
6-inch — 15.2  Cm.   Beam.  Sensibility   1-50    (.02)    Mg. — 1-3200  Gr. 

This  balance  is  similar  to  Type  H,  excepting  the  beam,  which  is  graduated  and 
provided  with  rider  apparatus  on  right  hand  side  only  and  adjusted  to  a  sensi- 
bility of  1-50  milligramme.  Has  latest  improved  rider  apparatus,  agate  bear- 
ings and  edges,  plate-glass  sub-base,  fall-away  pan  rests,  etc.  In  French  polished 
mahogany  case,  with  counterpoised  sliding  door. 

Dimensions,  20  x  17  x  10  inches — 50  x  43  x  25  centimeters. 

In  the  engraving  the  counterpoised  sliding  door  has  been  removed  to  better 
illustrate  the  balance. 


Weight,  net,   20   pounds — 9.1   kilos.     Packed,   50   pounds — 22.5  kilos, 
export  in  zinc-lined  case,  60  pounds — 28  kilos. 


Packed   for 


Dimensions,  27x21x15  inches — 68x53x38  centimeters. 
Price  ..  ....,$110.00 


AINSWORTH'S  TYPE   K   BUTTON   BALANCE. 
8-inch— 20  Cm.   Beam.  Sensibility   1-50   (.02)    Mg.— 1-3200   Gr. 

No. 

215a     Similar  to  Type  J,  only  slower,  owing  to  the  difference  in  length  of  beam  (2  inches). 

Dimensions,  27  x  21  x  15  inches — 68  x  53  x  38  centimeters. 
Price  ..  $100.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


31 


216 


217 


TROEMNER'S   NO.  08   (NEW)   SHORT  ARM   ASSAY   BALANCE. 


5-inch   Beam. 


No. 
216 


Sensibility  1-200   Mg. 


This  balance  is  of  the  same  type  and  finish  as  No.  5,  except  that  it  is  smaller 
and  has  5-inch  beam  of  special  aluminum  alloy,  oxidized  black  with  white  divi- 
sions, and  is  divided  into  100  parts  each  side  of  the  center  knife  edge.  The 
rider  carriage  has  full  clear  sweep  and  is  provided  with  adjustable  reading 
glass  for  the  beam.  Has  fall-away  beam  and  pan-rests.  All  the  bearings  and 
edges  are  of  agate.  There  is  a  reading  glass  for  ivory  index.  The  case  is  of 
old  mahogany,  finely  finished,  with  glass  sides,  back  and  top;  the  sub-base  is 
of  black  plate-glass,  and  the  whole  is  as  nearly  dust  proof  as  it  is  possible 
to  make  it. 

Price  ..  .   $165.00 


TROEMNER'S  NO.  5  ASSAY  BALANCE. 


8-inch   Beam. 


No. 
217 


Sensibility  1-400   Mg. 


This  balance  is  of  the  very  highest  type,  and  has  special  alloy  aluminum  beam 
8  inches  long,  and  graduated  both  sides  of  the  center  knife  edge  into  100  divi- 
sions, and  oxidized  black  with  white  divisions,  making  it  clear  and  easy  to  read. 
The  rider  carriage  has  full  clear  sweep,  and  is  provided  with  a  specially  ground 
reading  glass,  which  is  adjustable.  Has  fall-away  beam  and  pan-rests,  which 
releases  the  beam  first  and  then  the  pans,  and  is  free  from  jerks  and  kicks. 
All  bearings  and  edges  are  of  agate.  An  adjustable  reading  glass  is  provided 
for  the  ivory  index.  The  case  is  of  the  finest  old  mahogany,  finely  finished 
with  glass  sides,  back  and  top,  the  sub-base  is  of  black  plate-glass,  the  whole 
being  as  nearly  dust  proof  as  it  is  possible  to  make  it. 

Price  ..  $175.00 


32 


THE  DENVER  FIRE  CLAY  COMPANY. 


218 


219 


TROEMNER'S  NEW  NO.  7  ASSAY  BALANCE. 


5-inch  Beam. 


Sensibility  1-200  Mg. 


No. 

218  Single  column.  The  beam  is  of  special  aluminum  alloy,  oxidized  black  with 
white  divisions;  it  is  divided  into  100  divisions  each  side  of  the  center  knife 
edge.  The  rider  carriage  has  full  clear  sweep,  and  is  provided  with  a  specially 
ground  reading  glass  for  the  beam.  Has  fall-away  beam  and  pan-rests.  All  the 
bearings  and  edges  are  of  agate.  There  is  an  adjustable  reading  glass  for  ivory 
index.  The  case  is  of  the  finest  old  mahogany,  finely  finished,  with  glass  sides, 
top  and  back,  the  sub-base  is  of  black  plate-glass,  and  is  as  nearly  dust  proof 
as  it  is  possible  to  make  it. 

Price  ..  .  $175.00 


TROEMNER'S  NO.  3  ASSAY  BALANCE. 


7^2-inch   Beam. 


Sensibility   1-100    Mg. 


No. 

219  It  is  intended  for  use,  and  will  do  all  the  practical  work  the  assayer  has  to  do, 
and  do  quickly,  at  the  smelter.  The  beam  is  of  special  alloy,  oxidized  black 
with  white  divisions,  and  is  divided  into  50  divisions  each  side  of  the  center 
knife  edge.  The  rider  carriage  has  full  clear  sweep.  Has  fall-away  beams  and 
pan  rests.  All  the  bearings  and  edges  are  of  agate.  The  case  is  of  old  ma- 
hogany, finely  finished,  with  glass  top,  sides  and  back,  the  sub-base  is  of  black 
plate-glass,  and  is  as  nearly  dust  proof  as  it  is  possible  to  make  it. 

Price  .  $95.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


33 


O 


O 


220 


221 


TROEMNER'S  NO.  2  ASSAY   BALANCE. 


7J/2-inch    Beam. 


Sensibility   1-50   Mg. 


No. 

220 


The  beam  is  of  aluminum  alloy,  and  is  divided  on  the  right  side  only  of  the  center 
knife  edge  into  50  divisions.  The  rider  carriage  has  full  clear  sweep.  Has  fall 
beam  and  pan-rests.  All  the  bearings  and  edges  are  of  agate.  The  case  is  of 
the  finest  old  mahogany,  finely  finished,  with  glass  front,  back  and  sides,  and 
is  as  nearly  dust  proof  as  it  is  possible  to  make  it. 


Price  $80.00- 


No. 

221 


OERTLING'S  ASSAY  BALANCE  NO.  12. 
10-inch    Beam.  Sensibility    1-100    Mg. 

In  polished  mahogany  case  with  counterpoised  door,  plate-glass  bottom,  two  levels 
and  leveling  screws,  double  column;  the  beam  is  divided  on  each  side  of  the 
center  into  fiftieths  of  a  milligramme,  bearings  agate.  One  milligramme  rider 
furnished  with  each  balance. 


Price  $175.00- 


THE  DENVER  FIRE  CLAY  COMPANY. 


222 


BECKER'S  ASSAY   BALANCE   NO.  4,   SHORT   BEAM. 


No. 

222 


In  French  polished  mahogany,  glass  case,  front  sliding  frame  counterpoised,  with 
glass  top  to  admit  more  light  on  the  rider.  All  parts  of  the  balance  are  mounted 
and  fastened  on  plate-glass  5-16  in.  thick,  so  that  nothing  can  get  out  of  order 
through  warping  of  the  wood.  Agate  bearings  and  agate  knife  edges;  beam 
graduated  into  1-50  milligramme  and  the  rider  can  be  placed  on  the  center  of 
the  beam  and  used  from  the  0  point  to  either  end  of  it.  Needle  deviates  50 
divisions  on  the  scale  for  1  milligramme.  A  1  and  2-10  milligramme  rider  in- 
cluded. 


Price $135.00 

222a     Same  as  No.  222,  with  aluminum  beam,  bows,  pans,  etc 145.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


35 


This  attachment  and  the  rid- 
ers used  in  connection  with  it 
take  the  place  of  all  flat  weights 
on  Button  Balances  for  weigh- 
ing up  to  72  milligrammes,  and 
on  Analytical  Balances  up  to  720 
milligrammes.  The  attachment 
is  very  simple,  being  operated 
from  the  outside  of  the  balance 
case.  It  consists  of  a  movable 
wheel  or  carrier  with  seven 
arms,  each  arm  carrying  a  rider 
of  different  weight. 

On  Button  Balances  the  riders 
used  are  1,  2,  3,  5,  10,  20  and  30 
milligrammes,  and  on  Analytical 
Balances  10,  20,  30,  50,  100,  200 
and  300  milligrammes.  The  end 
of  each  rider  is  formed  to  indi- 
cate its  weight. 


THOMPSON'S    MULTIPLE    RIDER   ATTACHMENT. 

Patented  August  30,  1904. 

When  a  balance  is  equipped  with  this  attachment,  the  operator,  instead  of  having 
to  use  tweezers  to  place  small  flat  weights  in  the  pan,  places  these  wire  weights 
or  riders  on  the  support  provided  for  this  purpose,  which  is  equivalent  to 
placing  flat  weights  of  the  same  value  in  the  pan. 

To  obtain  fractions  of  a  milligramme,  a  1  milligramme  rider  is  used  on  the  beam. 


AINSWORTH'S    MULTIPLE    RIDER    ATTACHMENT. 

The   above   illustration   shows   Ainsworth's   Improved   Multiple   Rider   Carrier,   as 

adapted    to    button   balances,   for    weighing   without   the    use   of   the   ordinary 

weights  as  used  in  the  pan. 
The  riders  maintain  their  original  accuracy  even  after  months  of  constant  use, 

and  not  being  subjected  to  the  continual  handling  with  tweezers,  do  not  become 

bent  or  broken. 
Each  rider  is  carried  on  a  separate  arm  a  short  distance  above  the  bar  on  the 

stirrup,  and  it  is  only  necessary  to  move  the  number  on  the  lower  rod  until  it 

stands   opposite   the  index  pointer,   and   then   revolve  the  rod   slightly,   which 

transfers  the  rider  from  the  arm  to  the  stirrup. 
Each  rider  has  its  individual  arm  for  manipulating  and  cannot  become  misplaced, 

thereby  causing  an  error  in  the  following  weighing. 
Buttons  weighing  up  to  42  milligrammes  can  be  weighed  with  the  regular  carrier 

and  for  larger  capacities  additional  arms  may  be  added. 
When  weighing  a  button  at  or  near  the  capacity  of  the  carrier,  all  of  the  riders 

may  be  shifted  to  the  stirrup  simultaneously,  and  those  not  needed  transferred 

back  to  their  respective  arms.    The  figures  on  the  front  of  arms  down  indicating 

the  combined  weight  of  the  riders  on  the  stirrups. 

Price,  attached  to  new  balance  when  ordered $35  00 

Price,  attached  to  old  balance 40.00 


36 


THE  DENVER  FIRE  CLAY  COMPANY. 


AINSWORTH'S  TYPE  RA  PORTABLE  BUTTON  BALANCE. 

5-inch— 12.7  Cm.  Beam.  Sensibility  1-100  (.01)    Mg.— 1-6500  Gr. 

and 
TYPE  N  PORTABLE  PULP  BALANCE. 


8-inch — 20  Cm.  Beam. 


Sensibility  1   Mg. — 1-65  Gr. 


Capacity,  200  grammes — 8  ounces. 

No. 

223       The  above  illustration  shows  our  Types  RA  and  N  Portable  Button  and  Pulp  Bal- 
ances, packed  in  a  single  mahogany  carrying  case. 
This  is  a  very  compact  and  convenient  prospecting  outfit. 
All  parts  of  the  Pulp  Balance  pack  in  the  drawer,  and  Button  Balance  has  special 

device  for  locking  boam  in  position. 

Dimensions  of  carrying  case,  7  x  14  x  11  inches — 17  x  35  x  28  centimeters. 
Weight,  net,   9%    pounds — 4%    kilos.     Packed,   20   pounds — 9   kilos.     Packed   for 

export  in  zinc-lined  case,   24  pounds — 11  kilos. 
Dimensions,  11  x  19  x  16  inches — 28  x  48  x  40  centimeters. 

Price  .  $95.00 


TYPES  R  AND   N. 

No. 

223a    In  single  carrying  case  same  as  Types  RA  and  N,  but  with  single  rider  apparatus 
on  Button  Balance. 

Price  .  .   $90.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


37 


224 

THOMPSON'S  COMPLETE   PORTABLE  BALANCE  OUTFIT,  STYLE  NO.  27. 
No. 

224       This  outfit  consists  of  Button   Balance,   Style   No.   24,  and   Pulp  Balance,   Style 

No.  37,  together  in  one  carrying  case. 
Dimensions  of  carrying  case,  12x13x7%  inches. 
Price $100.00 

THOMPSON'S   BUTTON   BALANCE,  STYLE   NO.  24. 
5-inch   Beam.  Sensibility  1-100   Mg. 

No. 
224a     Has  double  rider  attachment,  agate  edges  and  bearings,  fall-away  pan-rests,  levels 

and  leveling  screws. 
Polished  mahogany  case  with  sliding  door,  which  can  be  fastened  at  any  point  by 

turning  the  knob. 

By  simply  pressing  a  button  the  beam  is  locked  in  place  for  transport. 
Price  $85.00 

THOMPSON'S   PULP   BALANCE,   STYLE    NO.  37. 

7-inch  Beam.  Sensibility   1    Mg. 

No. 
224b     On  mahogany  base  with  drawer  in  which  the  column,  beam,  hangers  and  pans 

can  be  packed  for  convenience  in  shipping.    Pans  3  inches  in  diameter. 
Dimensions,  6  x  11  x  2%  inches. 
Price  $13.00 


38 


THE  DENVER  FIRE  CLAY  COMPANY. 


225  Style  S. 


225P 
DENVER  BALANCE  CO.'S  PORTABLE  BUTTON  BALANCE  S. 


5-inch  Beam. 


No. 

225 


Sensibility  1-50  to   1-100   Mg. 


Has  agate  edges  and  bearings,  fall-away  pan-rests,  level  and  leveling  screws. 
The  beam  is  unobstructed  on  top  and  is  provided  with  a  locking  device  securely 
holding  it  in  place  while  in  transport. 

The  case  is  of  walnut,  French  polished,  and  of  the  beveled  front  pattern;  has 
sliding  door,  which  can  be  held  at  any  point.  These  are  good,  substantial 
balances,  capable  of  withstanding  a  reasonable  amount  of  hard  usage,  and  of 
a  much  better  grade  than  other  makes  of  same  price  and  capacity.  All  material 
is  of  the  best. 
Dimensions  of  carrying  case,  13x12x7%  inches.  Weight,  outfit  complete,  14  Ibs. 

Price,  Style  S,  sensitive  to  1-50  mg.,  single  rider  attachment $  85.00 

Price,  Style  S,  sensitive  to  1-50  mg.,  double  rider  attachment 90.00 

Price,  Style  S,  sensitive  to  1-100  mg.,  double  rider  attachment 112.00 

In  combination  with  Style  O,  Portable  Pulp  Balance,  extra 15.00 

STYLE  O,  PORTABLE  PULP  BALANCE. 

6-inch   Beam.                                                                                 Sensitive  to   1    Mg. 
Fitted  with  level  and  leveling  screws,  2%-inch  pans,  mounted  on  a  French  polished 
mahogany  base,  into  the  drawer  of  which  th^e  beam,  column,  hangers  and  pans 
pack  for  carrying. 
Price  $  15.00 

POCKET  ASSAY   BALANCE  NO.  5A. 

No. 

225P  For  Traveling,  when  closed,  measures  6  inches  long,  2%  inches  wide,  and  1%  inches 
high.  Is  raised  and  lowered  by  means  of  drop  lever.  Including  weights,  10 
grammes,  down  to  1  mg.,  neatly  fitted  in  box  as  shown  in  cut.  Shows  4  divi- 
sions for  1  mg. 

Price  .    $  18.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


39 


225a 
DENVER  BALANCE  CO.'S  PORTABLE  BUTTON  BALANCE  R. 


4-inch   Beam. 


No. 
225a 


Sensitive  1-100  to  1-200   Mg. 


This  balance  has  been  designed  and  constructed  with  the  view  of  furnishing 
assayers  and  mine  experts  in  need  of  a  more  accurate  and  up-to-date  portable 
balance  than  has  heretofore  been  obtainable. 

The  beam,  similar  to  Style  H,  is  provided  with  a  locking  device  which  securely 
holds  it  in  place  while  in  transport,  or  while  the  hangers  are  being  put  in  place, 
a  pressure  on  a  push  button  and  a  slight  turn  of  the  thumb  piece  being  all  that 
is  necessary  to  securely  lock  or  release  it.  The  beam  is  unobstructed  on  top, 
allowing  the  riders  to  be  placed  at  any  point  desired. 

This  balance  has  improved  double  rider  attachment,  agate  edges  and  bearings, 
fall-away  pan-rests,  levels  and  leveling  screws.  The  index  is  provided  with  a 
strong  reading  glass,  which  is  easily  detached  and  may  be  used  for  other 
purposes. 

Dimensions  of  carrying  case,  13x9x7%  inches.  Weight  of  Style  R  and  carrying 
case.  10  Ibs. 

Price,  Style  R,  sensitive  to  1-100  mg $150.00 

Price,  Style  R,  sensitive  to  1-200  mg 165.00 

In  combination  with  style  O,  Portable  Pulp  Balance,  extra 15.00 


No. 

226 


226 
TROEMNER'S  LATEST  PORTABLE  ASSAY   BALANCE. 


The  beam  is  of  aluminum  alloy,  oxidized  black  with  white  divisions,  and  is  divided 
both  sides  of  the  center  knife  edge  into  50  divisions.  The  rider  carriage  has  full 
clear  sweep.  Has  fall-away  beams  and  pan  rests.  Agate  knives.  The  beam  need 
not  be  taken  off  the  fulcrum  to  carry  it  about,  as  it  is  held  in  its  correct  position 
by  a  specially  made  clamp,  and  can  be  carried  or  packed  in  any  position  without 
the  least  liability  to  become  injured;  it  can  be  set  up  instantly  for  use. 

The  case  is  of  old  mahogany,  finely  finished,  with  glass  sash  front  and  back.  Size, 
•7%  x  8*4  x  2l/2  inches.  The  outside  case  is  of  walnut,  with  lock  and  key  and  trunk 
strap  with  handle.  Size,  8%  x  9%  x  5  inches.  The  handiest  and  most  efficient 
Portable  Assay  Balance  made;  with  set  of  platinum  weights,  1  gramme  to  1-10 
milligramme. 
Price  $70.00 


40 


THE  DENVER  FIRE  CLAY  COMPANY. 


227 


No. 

227 


THOMPSON'S  ANALYTICAL  BALANCE,  STYLE  NO.  28. 

6-inch    Beam.  Sensibility    1-20    Mg. 

Capacity,  200  grammes  in  each  pan. 


With  this  balance  all  weights  below  y2  gramme  are  manipulated  from  outside 
of  the  case  by  means  of  the  multiple  Rider  Attachment. 

The  balance  has  agate  edges  and  bearings,  star -wheel  balancing  device,  skele- 
ton hangers,  rider-rod  lock,  levels  and  leveling  screws. 

Polished   mahogany   case  with   counterpoise   door   and   glass   base. 

Dimensions,  20  x  17  x  10  inches. 

Price,  as  illustrated  and  described  $145.00 

Price,  without  Multiple  Rider  Attachment  120.00 


THOMPSON'S  ANALYTICAL  BALANCE,  STYLE  NO.  29. 

6-inch  Beam.  Sensibility  1-20   Mg. 

Capacity,  200  grammes  in  each  pan. 
No. 

227a  Has  agate  edges  and  bearings,  star -wheel  balancing  device,  double  rider  attach- 
ment, skeleton  hangers,  three-inch  glass  pans,  fall-away  pan-rests,  rider-rod  lock, 
levels  and  leveling  screws. 

Polished  mahogany  case  with  counterpoise  door. 
Dimensions,  20x17x10  inches. 

Price $110.00 

Price,  with  Multiple  Rider  Attachment 135.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


41 


228 


THOMPSON'S  CHEMICAL  BALANCE,  STYLE  NO.  31. 


6-inch   Beam. 


Sensibility   1-10   Mg. 


No. 

228 


Has   single   rider   attachment,   steel   knife   edges   and   agate   bearings,   three-inch 
metal  pans,  fall-away  pan-rests,  levels  and  leveling  screws. 

Mahogany  case  with  counterpoise  door. 
Dimensions,  20  x  17  x  10  inches. 


Price $  65.00 

Becker's,  Kern's,  Standinger's,  or  any  other  foreign  make  of  Balances  imported  to  order. 

Prices  quoted  upon  application. 


42 


THE  DENVER  FIRE  CLAY  COMPANY. 


No. 


229 


AINSWORTH'S   ANALYTICAL    BALANCE,   TYPE    Q. 

7-inch  Beam.  Sensibility,  1-20  Mg. 

Capacity,  200  grammes. 


229  An  analytical  balance  of  precision  with  hard  rolled  nickel  aluminum  beam,  agate 
edges  and  bearings,  double  rider  apparatus,  of  improved  construction,  skeleton 
hangers. 

Has  two  level  vials  set  in  base,  extension  glass  sub-base  covering  entire  top  of 
base;  all  metal  work  gold  plated  except  the  center  bearings  and  drop  levers. 
Drop  levers  swing  from  center  coincident  with  contact  line  of  center  edge  and 
release  all  contacts  with  the  edges  when  loading  the  balance. 

Has  finely  polished  French  mahogany  case  with  counterpoised  sliding  door  in 
front  and  removable  sliding  door  in  back. 

In  the  engraving  the  front  door  has  been  removed  to  better  illustrate  the  balance. 

Dimensions  of  case,  20x20x10  inches. 

Weight,  net,  20  pounds.     Packed,  60  pounds. 

Price .    $125.00 


No. 


AINSWORTH'S  ANALYTICAL   BALANCE,  TYPE  T. 


230       Similar  in  all  respects  to  Type  Q,  No.  229,  but  with  6-inch  beam. 
Price  .. 


$125.00 


Either  of  the  above  types  can  be  furnished  adjusted  to  a  sensibility  of  1-50  milli- 
gramme, for  $15.00  (list)  additional. 


AINSWORTH'S  IMPROVED  MULTIPLE   RIDER  CARRIER  FOR  TYPES  Q  AND  T. 
No. 

230a     Similar  to  that  shown  on  page  35,  but  with  capacity  of  1000  milligrammes;  render- 
ing unnecessary  the  handling  of  fractional  gramme  weights. 

Price .   $  50.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


231 


AINSWORTH'S  TYPE   L   ANALYTICAL   BALANCE. 


6-inch — 15.2  Cm.   Beam. 


Sensibility  1-10   (.1)    Mg.— 1-650  Gr. 


No. 

231 


Capacity,  200  grammes — 8  ounces. 

This  balance  is  of  the  latest  improved  construction,  the  yokes  and  pan-rests  being 
operated  by  a  single  thumb-piece,  the  same  as  our  button  balance  and  having 
the  same  action.  A  balance  of  this  construction  can  be  operated  more  rapidly 
than  where  the  pan-rests  are  operated  by  a  separate  button. 

Has  agate  bearings  and  single  rider  apparatus  of  improved  construction.  In 
French  polished  mahogany  case  with  counterpoised  sliding  door. 

Dimensions  of  case,  20  x  17  x  10  inches — 50  x  43  x  25  centimeters. 

Weight,  net,  18  pounds — 8.1  kilos.  Packed,  50  pounds — 22.5  kilos.  Packed  in  zinc- 
lined  case  for  export,  60  pounds — 28  kilos. 

Dimensions,  27  x  21  x  15  inches — 68  x  53  x  38  centimeters. 


Price  $65.00 


AINSWORTH'S    TYPE    LA    ANALYTICAL    BALANCE. 


No. 

231a     Same  as  above,  but  with  agate  edges  instead  of  steel. 

Price  . 


$75.00 


44  THE  DENVER  FIRE  CLAY  COMPANY. 


232 


AINSWORTH'S  TYPE  P  ANALYTICAL  BALANCE. 

6-inch— 15.2  Cm.   Beam.  Sensibility   1-10    (.1)    Mg.— 1-650  G,\ 

Capacity,  200  grammes — 8  ounces. 

No. 

232       This  type  has  agate  bearings  and  6-inch  hard  rolled  brass   beam.     It  is  a  good 

balance  for  rough  analytical  work  and  an  excellent  pulp  balance. 
Has  French  polished  mahogany  case  with  counterpoised  sliding  door. 
In  the  engraving  the  counterpoised  sliding  door  has  been  removed  to  better  illus- 
trate the  balance. 

Dimensions  of  case,  20  x  17  x  10  inches — 50  x  43  x  25  centimeters. 
Weight,  net,  18  pounds — 8.1  kilos.    Packed,  40  pounds — 18.1  kilos.    Packed  in  zinc- 
lined  case  for  export,  50  pounds — 22.5  kilos. 
Dimensions,  27  x  21  x  15  inches — 68  x  53  x  38  centimeters. 

Price   .   $45.00 


AINSWORTH'S    TYPE    PC    ANALYTICAL    BALANCE. 

No. 

232a     Same  as  Type  P,  but  with  single  rider  apparatus. 

Price  .  .   $50.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


45 


234 


TROEMNER'S  ANALYTICAL  BALANCE  NO.  10. 


7-inch  Beam. 


Sensibility  1-20  Mg. 


Capacity,  200  grammes. 


No. 

234 


Short  arm  pure  aluminum  beam,  agate  planes  and  agate  knives,  no  steel  used, 
both  arms  of  the  beam  are  graduated;  the  pans  also  of  aluminum;  all  the 
brass  work  is  plated  with  gold;  elegant  mahogany  case  (old  wood)  with  heavy 
plate-glass  bottom;  case  has  glass  top  to  admit  light  freely;  is  provided  with 
improved  self-locking  pan-arrest  (push  in  the  button,  turn  slightly  to  the  left, 
this  locks  the  arrest).  All  the  workmanship  is  of  the  very  finest. 


This  balance  is  in  use  at  the  U.  S.  Coast  Survey,  and  by  all  the  large  steel  and 
iron  works. 


Price  . $125.00 


46 


THE  DENVER  FIRE  CLAY  COMPANY. 


240-242 


BECKER'S  SHORT  BEAM  ANALYTICAL  BALANCE  NO.  8A. 


No. 

240  For  a  charge  up  to  200  grammes  in  each  pan;  sensible  to  1-20  milligramme. 

In  French  polished  mahogany  glass  case,  front  sliding  frame  counterpoised,  with 
glass  top  to  admit  more  light  on  rider.  Mounted  on  plate-glass  5-16  inches  thick. 
All  bearings  and  knife  edges  of  agate;  beam  graduated  in  1-10  milligramme  so 
that  the  rider  can  be  placed  on  the  center  and  used  from  the  0  point  to  either 
end.  Provided  with  new  improved  arrangement  for  arrest  of  pans  and  beam, 
riders,  apparatus  for  specific  gravity  and  for  weighing  tubes.  Pars  2%  inches 
diameter;  width  of  pan  support  4  inches. 

Price $125.00 

241  Same  as  No.  240,  with  aluminum  beam,  bows,  etc 145.00 

242  Same  as  No.  240,  imported,  gold  plated 110.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


47 


244-245 


BECKER'S  ANALYTICAL  BALANCE  NO.  7. 


No. 

244 


For  a  charge  up  to  100  grammes  in  each  pan,  in  French  polished  glass  case,  front 
sliding  frame  counterpoised. 

All  bearings  agate  planes;  with  new  improved  arrangement  for  arrest  of  pans  and 
beam;   sensible  to  1-20  milligramme  with  its  full  charge. 

Provided  with  apparatus  for  specific  gravity,  rider  and  for  weighing  tubes.    Beam 
divided  into  1-10  part  of  milligramme.     Pans  2%  inches  diameter. 


Price $85.00 

245       Same  as  No.  244,  with  agate  knife  edges  95.00 


48 


THE  DENVER  FIRE  CLAY  COMPANY. 


No. 

246 


248 
250 


No. 

252 


253 


BECKER'S  SHORT  BEAM   BALANCE   NO.  6A. 

In  mahogany  French  polished  glass  case,  glass  top  for  light  on  rider,  front  frame 

counterpoised.     For  a  charge  up  to  100  grammes  in  each  pan;   sensible  to  1-10 

milligramme. 
Beam  graduated  in  1-5  milligramme,  provided  with  improved  pan  arrest,  riders, 

agate  bearings,  etc. 

Price $60.00 

Same  as  No.  246,  with  agate  knife  edges  68.00 

Same  as  No.  246,  with  agate  knife  edges,  aluminum  beam,  bows,  pans,  etc. .     80.00 


253 
BECKER'S  IMPROVED  ANALYTICAL  BALANCE  NO.  6. 

For  charge  up  to  100  grammes  in  each  pan;  in  French  polished  glass  case,  front 
sliding  frame   counterpoised;    all  bearings   agate;    sensible  to    %   milligramme 
with  its  full  charge;  with  arrest  for  pans. 
Price . $45.00 

Same  as  No.  252,  improved  with  arrangement  for  rider 50.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


49 


No. 
254 


256 


254-255 


256 


BALANCE,   SARTORIUS'   ANALYTICAL   NO.   5. 

With  straight  heam  of  phosphor-bronze  or  aluminum,  which  likewise  serves  as  a 
rider  slide,  circular  arresters,  adjustable  knife-edges,  compensating  suspensions 
and  mechanical  rider  displacement.  The  pans  are  platinum  plated.  The  knife 
edges  and  planes  are  made  of  agate.  The  bottom  is  of  black  plate  glass.  This 
balance  swings  unusually  rapidly. 

It  is  largely  used  in  university  and  factory  laboratories. 

Capacity  100  grammes,  sensitiveness  1-10  milligramme $110.00 

Capacity  200  grammes,  sensitiveness  1-10  milligramme 120.00 

BALANCE,  SARTORIUS'  ANALYTICAL  NO.  6. 

Same  sensitiveness  as  No.  5,  but  not  so  elegantly  finished;  has  pillar  of  bronzed 
cast  iron,  instead  of  lacquered  brass. 

Capacity  200  grammes,  sensitiveness  1-10  milligramme $  90.00 

Capacity  500  grammes,  sensitiveness  15-100  milligramme   110.00 

BALANCE,  SARTORIUS'  MODEL  "AMERICA." 

The  compensating  hangers  are  made  in  one  piece,  which  prevents  their  falling 
apart,  and  being  suspended  on  three  points,  they  allow  for  uneven  balancing; 
Magnalium  short  beam,  rider  arrangement,  agate  knife-edges  and  bearings, 
platinum  plated  pans;  capacity,  200  grammes,  sensitive  to  1-10  milligramme; 
a  well  built,  inexpensive  balance,  suitable  for  general  analytical  work.  Highly 
recommended. 


Price  $65.00 


50 


THE  DENVER  FIRE  CLAY  COMPANY. 


260 


No. 

260 


THOMPSON'S  PULP  BALANCE,  STYLE   NO.  33. 
6-inch  Beam.  Sensibility  1-10  Mg. 

Has  steel  edges  and  agate  bearings,  fall-away  pan-rests,  3-inch  metal  pans. 
Mahogany  case  with  counterpoised  door. 
Dimensions,  20  x  17  x  10  inches. 

Price  .  .   $55.00 


No. 

261 


THOMPSON'S  PULP  BALANCE,  STYLE  NO.  35. 
7-inch   Beam.  Sensibility   1-4   Mg. 

Has  steel  knife  edges  and  agate  bearings,  adjustable  pan-rests,  3-inch  metal  pans, 

fly  balancing  device,  level  and  leveling  screws. 
Mahogany  case  with  counterpoised  door. 
Dimensions,  l?1/^  x  8  x  15  inches. 


Price  .  . .   $35.00 


THOMPSON'S  PULP  BALANCE,  STYLE   NO.  36. 

7-inch  Beam.  Sensibility  1-4  Mg. 

No. 

261a  Similar  to  Style  No.  35,  but  has  no  arms  to  prevent  beam  from  falling  off  when 
one  hanger  is  removed,  and  center  edge  is  not  raised  off  bearing  when  balance 
is  not  in  use. 

Mahogany  case  with  counterpoised  door. 
Dimensions,  17^x8x15  inches. 

Price  .  $32.50 


THE  DENVER  FIRE  CLAY  COMPANY. 


51 


262 


No. 
262 


AINSWORTH'S  TYPE  M   PULP  BALANCE. 


6-inch — 15.2  Cm.   Beam. 


Sensibility   1-2    (.5)    Mg.   1-130   Gr. 


Capacity,  200  grammes — 8  ounces. 

Has  agate  bearings,  pan-rests,  level  and  leveling  screws,  and  is  ordinarily  furnished 
with  2%-inch  pans,  but  3-inch  pans  will  be  furnished  when  specified. 

Has  French  polished  mahogany  case  with  counterpoised  sliding  door. 

Dimensions,  17  x  15  x  8  inches — 43  x  38  x  20  centimeters. 

In  the  engraving  the  counterpoised  sliding  door  has  been  removed  to  better  illus- 
trate the  balance. 

Weight,  net,  10  pounds — 4.5  kilos.  Packed,  30  pounds — 13.6  kilos.  Packed  for 
export  in  zinc-lined  case,  36  pounds — 16  kilos. 

Dimensions,  24x13x18  inches — 60x32x46  centimeters. 

Price  .  .   $30.00 


No. 

263 


AINSWORTH'S    PULP   SCALE,   TYPE    N. 


8-inch  Beam. 


Capacity,  200  grammes. 


Sensibility  1    Mg. 


Similar  to  Type  M  in  general  construction;  without  glass  case;  but  mounted  on 
polished  mahogany  base,  into  the  drawer  of  which  the  beam,  column,  hangers 
and  pans  pack  for  carrying;  has  21/£-inch  pans. 

Dimensions  of  case,  12  x  6  x  3  inches. 

Price,  without  weights $15.00 


No. 
263a 


THOMPSON'S  PULP  SCALE  NO.  37. 


Sensibility  1  milligramme.  Mounted  on  polished  mahogany  base,  without  glass 
case,  but  has  drawer  in  which  the  column  beam  hangers  and  pans  can  be  packed 
for  convenience  in  shipping.  Fly  adjustment.  Pans  3  inches  in  diameter. 

Price  .  .   $13.00 


52 


THE  DENVER  FIRE  CLAY  COMPANY. 


265a 


No.  TROEMNER'S  PULP  SCALE  NO.  26. 

264  In  French  polished  mahogany  case,  with  counterpoised  sliding  door;  has  movable 

nickel  pans,  adjusting  screws  on  beam;  eccentric  lift;  glass  level  and  leveling 

screws.     Sensible  to  1-30  grain;   capacity,  2  oz.  in  each  pan. 

Price $  27.00 

No.  TROEMNER'S  PULP  SCALE  NO.  25. 

265  In  polished  mahogany  case,  with  counterpoised  sliding  door,  leveling  screws,  glass 

level,  adjusting  screws  at  end  of  beam,  8-inch  beam,  3-inch  pans;   capacity,  10 

ounces. 

Price  $  30.00 

No.  TROEMNER'S  PULP  SCALE   NO.  63. 

265a     In  French  polished  mahogany  case,  with  counterpoised  sliding  door;    scale  is  of 

finest  finish,  all  lacquered  pans  of  solid  nickel;   improved  lifting  arrangement; 

adjusting  screws  on  beam;   diameter  of  pans  2%  inches;  beam  8-inch;   sensible 

to  1-50  grain. 

Price    $  22.00 

No.  TROEMNER'S  PULP  SCALE   NO.  22. 

266  Without  case,  on  French  polished  box  with  drawer,  lacquered  brass  beam  10  inches 

long,  movable  nickel-plated  brass  pans  4  inches  diameter.     Capacity,  10  ounces; 

sensible  to  1-30  grain. 

Price   .   $  18.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


53 


273 


No.  PULP   SCALE   NO.   16 

267  In  French  polished  glass  case,  with  counterpoised  sliding  door,  eccentric  for  lifting 

bows  and  movable  pans.    For  a  charge  up  to  2  oz.  in  each  pan;  sensible  to  1-60 

grain  or  1  milligramme. 

Price $  22.00 

No.  PULP  SCALE   NO.  18. 

268  Same  as  No.  267,  but  for  a  charge  up  to  5  oz.  in  each  pan.    Sensible  to  1-30  grain. 

Price $  26.00 

No.  PULP  SCALE   NO.  20. 

269  Same  as  No.  267,  but  for  a  charge  up  to  10  oz.  in  each  pan.    Sensible  to  1-30  grain. 

Price $  35.00 

No.  PULP  SCALE   NO.  22. 

270  Same  as  No.  267,  but  for  a  charge  up  to  20  oz.  in  each  pan.    Sensible  to  1-20  grain. 

Price $  42.00 

No.  PULP  SCALE   NO.   14. 

271  On  French  polished  box  with  drawer,  eccentric  for  lifting  bows  and  movable  pans. 

Can  be  charged  up  to  2  oz.  in  each  pan.     Sensible  to  1-50  grain. 

Price  $  1 1.00 

No.  PULP  SCALE  NO.  17. 

272  Same  as  No.  271,  but  for  a  charge  up  to  5  oz.  in  each  pan.    Sensible  to  1-30  grain. 

Price $  15.00 

No.  PULP  SCALE  NO.  19. 

273  Same  as  No.  271,  but  provided  with  set  screws  and  level,  for  a  charge  up  to  10  oz. 

in  each  pan.    Sensible  to  1-10  grain. 

Price $  22.00 

No.  PULP  SCALE   NO.  21. 

274  Same  as  No.  273,  but  for  a  charge  up  to  20  oz.  in  each  pan.    Sensible  to  1-10  grain. 

Price $  27.00 

No.  PULP  SCALE  NO.  23. 

275  Same  as  No.  273,  but  for  a  charge  up  to  50  oz.  in  each  pan.     Sensible  to  %  grain. 

Price $  35.00 


54 


THE  DENVER  FIRE  CLAY  COMPANY. 


MOISTURE  SCALES 


282 


281 


No. 
281 


NEW   MOISTURE   SCALE. 


Designed  and  manufactured  exclusively  by  The  Denver  Fire  Clay  Company.  The 
scale  is  so  constructed  that  on  using  a  moisture  charge  of  two  pounds  the 
sliding  weight  on  the  beam  indicates  the  exact  per  cent,  of  loss  or  moisture. 
Example:  Place  a  2-pound  weight  on  left-hand  platform,  counterpoised  with 
ore  to  be  tested  for  moisture  on  the  right;  then  dry  the  sample  so  weighed  and 
place  on  same  platform  as  before,  and  counterpoise  by  sliding  weight  on  beam, 
when  you  read  off  the  ounces  lost  and  per  cent,  of  loss.  For  absolute  accuracy 
and  simplicity  it  has  no  equal.  Any  other  weight  or  charge  may  be  used,  when 
a  simple  calculation  gives  correct  per  cent,  of  moisture.  This  scale  is  also 
useful  for  ordinary  weighing  purposes.  Including  2-pound  weight,  tin  scoop  and 
tare  weight. 

Price  .  .  $  10.00 


No. 

282 


283 


MOISTURE   SCALE. 


Used  at  smelting  and  similar  plants  for  determining  the  percentage  of  moisture 
in  ores,  etc.  The  ordinary  capacity  scale  is  made  to  weigh  a  sample  of  50 
ounces,  but  special  scales  are  manufactured  to  order  of  other  capacities  as  de- 
scribed below.  The  scale  beam  has  two  rows  of  graduation,  the  upper  row 
giving  the  weight  in  ounces,  or  pounds,  and  fractions  thereof;  the  lower  row 
giving  the  percentages.  The  percentage  row  on  all  scales  is  figured  100  to  0  per 
cent,  by  1  per  cent.,  and  thus  the  reading  gives  the  direct  percentage  of  loss. 
The  given  amount  of  ore  is  first  weighed,  then  dried  or  roasted,  and  reweighed 
to  note  the  loss  of  moisture  or  sulphur.  From  50  oz.  to  %  oz.  capacity. 

Price  $  10.00 

Same  as  No.  282,  from  50  oz.  to  y2  oz.,  but  with  fractional  graduations  of  1  x  1-10 
per  cent,  on  tip  end  of  the  main  beam,  and  both  the  main  and  fractional  beams 
are  fitted  with  patent  latch  poises. 


Prire 


$25.00 


284  Same  as  No.  282,  from  2  kilos  to  10  grammes  10.00 

285  Same  as  No.  283,  Metric,  with  fractional  graduation  25.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


55 


No. 

286 


MOISTURE   SCALE. 

Special  modification  of  -  Standard  Moisture  Scale  as  adopted  by  the  American 
Smelting  &  Refining  Company  and  Taylor  &  Brunton  as  their  standard. 

Description. 

This  scale  is  similar  to  No.  283,  but  is  provided  with  two  beams,  each  graduated 
on  both  sides.  Main  beam  graduated  to  4^  Ibs.  avoirdupois;  percentage  row 
to  90  per  cent.  Fractional  beam  graduated  to  %  Ib.  avoirdupois;  percentage 
graduation  from  1-10  of  1  per  cent,  to  10  per  cent.  Scale  is  fitted  with  seamless 
brass  scoop.  Beams  being  marked  on  both  sides  enables  both  buyer  and  seller 
to  read  the  weights. 

Price  Net  $20.00 


B  u  n  g  e's ,  Becker's, 
Sartorius',  Kern's  and 
other  makes  of  Balances 
imported  to  order  for 
institutions  of  learning 

FREE  OF  DUTY 


5(5 


THE  DENVER  FIRE  CLAY  COMPANY, 


BULLION  SCALES 


No. 

290 


290-290a 
BALL  SCALE  NO.  124. 

A  new  and  elegant  counter  scale;  our  latest  modification  in  weighing  apparatus. 
Scale  has  10-inch  nickel  pan;  has  extra  sliding  poise  to  balance  bottles,  etc.; 
will  weigh  from  *4  oz.  to  16  Ibs.  without  the  use  of  ordinary  weights;  elegantly 
finished  in  nickel  and  bronze.  In  every  respect  a  perfect  scale,  and  saves  the 
cost  of  a  set  of  weights;  diameter  of  pans  10-inch,  capacity  16  Ibs. 

Price  .  .   $14.00 


BALL   SCALE. 

No. 

290a     Same  as  above,  in  Metric  Standard,  capacity  6  kilos,  divisions  on  the  beam  1C 
grammes. 

Price  .  .   $14.00 


291-291a 


No. 
291 


D.  F.  C.  CO.'S  NEW  BULLION  SCALE. 

A  good  scale  for  all  purposes  where  weighing  closer  than  2-100  oz.  is  not  required. 
It  is  provided  with  weighing  beam  and  two  sliding  poises;  one  side  is  divided 
into  fifty  parts,  each  part  representing  2-100  oz.;  the  other  side  is  divided  into 
thirty-five  parts,  each  part  representing  1  oz.  troy.  A  bar  with  a  sliding  poise  is 
placed  under  the  weighing  beam  for  the  purpose  of  balancing  bullion  pan.  Ca- 
pacity, 600  oz.  Weights  included. 

Price  .  $25.00 


291a     Capacity,  1,000  oz.    Weights  included 30.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


57 


BULLION  SCALES 


292 


293 


293a 


No. 

292 


TROEMNER'S  BULLION  SCALE  NO.  189. 


With  6-inch  nickel  pans;  all  bearings  are  of  agate,  to  insure  the  highest  attain- 
able sensibility  with  endurance.  Sliding  beam  on  front,  divided  into  penny- 
weights and  grains,  by  which  the  exact  weight  of  an  article  is  quickly  ascer- 
tained, thus  doing  away  with  small  weights;  a  set  of  weights  (12  oz.)  is  ar- 
ranged en  a  platform  on  front  of  scale.  Scale  is  sensitive  to  l/2  grain. 

Price  .  $18.00 


TROEMNER'S  U.  S.  MINT  BULLION  SCALES,  FIG.  139. 
No. 

293      These  are  strictly  first-class  in  every  respect,  mounted  on  polished  walnut  box,  with 
drawer;  a  full  set  of  weights  included. 

No.  01234 

Capacity       64  32  16  8  4  oz. 

Each      ^24.00      15.00      1ZOO      10.00 


No. 
293a 


No. 

10  . 


TROEMNER'S   METRIC  SOLUTION  SCALES,  FIG.  801. 

An  even  balance  scale  for  making  rapidly  Reagents  or  any  other  kind  of  composite 
solutions. 

The  scale  has  two  movable  brass  pans,  and  the  weight  rack  is  attached  to  the  base 
of  the  scale,  and  in  it  are  fitted  the  weights,  which  are  made  of  solid  brass.  The 
scale  is  provided  with  a  side  beam  in  front,  undivided,  and  is  used  for  balanc- 
ing the  bottle  or  containers.  With  this  scale  can  be  made  the  most  accurate 
solutions.  Sensibility,  y2  gramme. 

Diam.  of  Pans.                     Capacity.  Price. 
9  in 5  kilos  to  1  gramme  $18.00 

5y2  in 1  kilo    to  1  gramme  15.00 


58 


THE  DENVER  FIRE  CLAY  COMPANY, 


No. 


294 


TROEMNER'S  BULLION  AND  SPECIE  SCALE,  NO.  24. 


294  Of  the  very  finest  finish;  in  French  polished  glass  case,  with  counterpoised  door, 
sliding  upward;  open  beam;  8-inch  movable  nickel  pans;  capacity,  200  oz.  and 
sensible  to  y2  grain;  has  extra  pan  for  loose  substances;  inside  measure  of  case 
is  35  inches  high,  30  inches  wide.  Complete  with  a  full  set  of  weights,  50  oz. 
to  1  grain,  being  neatly  fitted  inside  of  the  drawer. 

Price  $97.50 


295 


294a     Same  as  No.  294,  with  weights  100  oz.  and  down  (200  oz.  in  all). 

Price   .  .$107.50 


THE  DENVER  FIRE  CLAY  COMPANY. 


59 


296 


No. 

295 


295a 
295b 


No. 

296 


TROEMNER'S  BULLION  AND  SPECIE  SCALE,  NO.  170. 

With  brass  beam,  pans  and  bows;  improved  lifting  arrangement;  glass  level  and 
leveling  screws;  adjusting  screws  on  beam,  etc.  Complete,  with  full  set  of 
weights,  large  weights  of  bronzed  iron,  from  50  oz.  down  of  brass,  in  a  walnut 
block;  capacity  500  oz. 

Price  $  95.00 

Same  as  295,  capacity  1,000  oz 120.00 

Same  as  No.  295,  capacity  1,500  oz 150.00 

TROEMNER'S  BULLION  AND  SPECIE  SCALE,  NO.  175. 

Will  carry  2,000  oz.  in  each  pan;  open  brass  beam,  pans  and  arches  also  of  brass, 
with  complex  levers  to  arrest  the  beam  and  its  hangings;  platform  of  iron,  neatly 
japanned;  adjusting  screws  on  beam,  glass  level  and  leveling  screws;  sensible 
to  1-200  of  an  oz.  Without  weights. 

Price  .  .  .$210.00 


TROEMNER'S  BULLION  AND  SPECIE  SCALE,  NO.  176. 

No. 

296a      Same  as  No.  296;   capacity  500  oz.  in  each  pan;   sensible  to  1  grain.     Without 
weights. 

Price  .  $160.00 


60 


THE  DENVER  FIRE  CLAY  COMPANY, 


297 


No. 

297 


No. 
297a 


No. 
297b 


No. 

298 


No. 
298a 


No. 

298b 


BULLION  AND  SPECIE  SCALE,  NO.  23. 

On  French  polished  box  with  drawer;  provided  with  eccentric  for  lifting  bows  and 
movable  pans.  For  50  oz.  in  each  pan.  Sensible  to  l/2  grain  with  its  full  charge. 
Price  .  .  $35.00 


BULLION  AND  SPECIE  SCALE,   NO.  25. 

Same  as  No.  297.    For  100  oz.  in  each  pan.    Sensible  to  Vz  grain. 
Price 

BULLION  AND  SPECIE  SCALE,   NO.  27. 


$49.50 


Same  as  No.  297.    For  300  oz.  in  each  pan.   Sensible  to  1  grain  with  its  full  charge. 
Price  $66.00 

BULLION  AND  SPECIE  SCALE,  NO.  24. 

Same  as  No.  297,  but  in  French  polished  glass  case.    For  50  oz.  in  each  pan.    Sens- 
ible to  %  grain. 
Price $55.00 

BULLION  AND  SPECIE  SCALE,  NO.  26. 

Same  as  No.  298,  but  for  100  oz.  in  each  pan.    Sensible  to  %  grain. 
Price $76.00 

BULLION   AND  SPECIE  SCALE,  NO.  28. 

Same  as  No.  298,  but  for  300  oz.  in  each  pan.    Sensible  to  1  grain. 
Price $100.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


61 


No. 
299 


No. 
299a 


No. 
299b 


No. 
300 


No. 
300a 


No. 
300b 


BULLION  AND  SPECIE  SCALE,  NO.  29. 

Carrying  500  oz.  in  each  pan.     Sensible  to  1  grain  with  its  full  charge.    All 
bearings  agate  planes,  with  new  improved  construction  for  the  arresta- 
tion  of  beams  and  pans.    Provided  with  set  screws  and  level. 
Price $165.00 

BULLION   AND  SPECIE  SCALE,  NO.  31. 

Same  as  No.  299.    For  2,000  oz.  in  each  pan.     Sensible  to  2  grains  with  its 
full  charge. 
Price    $210.00 

BULLION  AND  SPECIE  SCALE,  NO.  33.      . 

Same  as  No.  299.    For  5,000  oz.  in  each  pan.     Sensible  to  2  grains  with  its 
full   charge. 
Price     $600.00 

BULLION  AND  SPECIE  SCALE,  NO.  30. 

In  French  polished  mahogany  glass  case,  with  counterpoised  front  sliding 
frame.   For  500  oz.  in  each  pan.   Sensible  to  y2  grain  with  that  charge. 
Price    $250.00 

BULLION   AND  SPECIE  SCALE,  NO.  32. 

Same  as  No.  300.    For  2,000  oz.  in  each  pan.    Sensible  to  1  grain. 
Price     $300.00 

BULLION  AND  SPECIE-  SCALE,  NO.  34. 

Same  as  No.  300.    For  5,000  oz.  in  each  pan.    Sensible  to  1  grain. 

Price     $750.00 


62 


THE  DENVER  FIRE  CLAY  COMPANY. 


Laboratory,  Hand  and  Pocket  Scales 


303 

No. 

301       Army  Prescription  Scale,  No.  9.     On  polished  box;  scale  can  be  taken  apart  and 

packed  away  in  drawer  of  box;   all  parts  nickel-plated;   including  a  set  of 

weights  from  2  drams  to  %  grain. 


Beam 


Gin. 


Each 


$3.CO 


5.00 


304 


304a 


303  Troemner's  "Climax"  Box  Prescription  Scale,  No.  120.     Has  2%-inch  nickel- 

plated  pans;  cherry-mahogany  box;  marble  top;  hinged  cover;  reli- 
able and  substantial  $12.50 

304  Troemner's  Box  Prescription  Scale,  No.  12.     In  French  polished  ebony  box 

with  marble  top,  which  has  counter-sunk  basin  in  it  to  hold  the 
weights;  pans  are  of  solid  nickel;  scale  is  sensible  to  1-30  grain;  has 
glass  cover  provided  with  stop  hinges,  all  of  the  finest  workmanship, 
and  one  of  the  most  popular  scales  we  have  ever  introduced.  To 
avoid  corrosion  and  cleaning  no  metal  parts  are  put  on  the  outside 
of  the  box,  excepting  the  pans  and  hinges.  Pans  3  and  3%-in. 


No. 


12 


13 


Each     $18.00 


20.00 


304a 


Troemner's  Bakers'  Scale,  so  named  as  it  was  originally  made  for  their 
use,  being  a  small  balance  with  large  pans;  length  12  inches;  width 
9  inches;  height  5  inches;  pans  5  inches  in  diameter;  beam  grad- 
uated up  to  5  grammes  and  divided  into  1-10  gramme ;  a  set  of  accurate 
brass  weights  in  block  which  is  fastened  to  the  front  of  the  scale,  are 
included;  capacity,  200  grammes  to  1-10  gramme 8.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


63 


307 


309a 


No. 

305 


Troemner's  Dispensing  Scale,  No.  6.  With  side  beam  and  sliding  weight, 
to  weigh  4  oz.  Handsomely  finished;  has  3%-inch  nickel-plated  mova- 
ble pans;  a  side  beam  in  front  of  scale  with  a  sliding  weight;  this 
beam  is  divided  into  120  divisions,  each  division  representing  one 
grain;  an  extra  row  of  metric  divisions  is  placed  on  bottom  edge  of 
beam,  each  representing  one  decigramme.  Platform  or  shelf  is  at- 
tached to  base  of  scale,  in  which  are  fitted  a  set  of  solid  brass  Troy 
weights,  2  oz.  and  down.  Sensible  to  %  grain.  Capacity  4  oz $8.00 

306  Troemner's  Laboratory  Scale,  No.  7.     Specially  designed  for  laboratory  and 

pharmaceutical  work;  has  6-inch  movable  nickel  pans;  will  carry  1 
Ib.  in  each  pan;  sensible  to  %  grain;  with  a  full  set  of  weights,  run- 
ning from  8  oz.  Troy  and  down  to  1  grain,  neatly  fitted  in  a  project- 
ing shelf  attached  to  the  base.  Metric  weights  furnished  in  place  of 
Troy  when  so  desired 9.00 

307  Balance,   Harvard  Trip.     With  2  six-inch  round  porcelain  plates  and  side1 

beam  for  laboratory  work;  capacity,  1  kilogramme  to  1-10  gramme  . . 


308 


Troemner's    Robervahl    Scale,   No.  75.     Neatly  ornamented   in   gold   lines; 
heavy  brass  pans  and  brass  indicator. 
No.  234 


Capacity 
Pans 


15 
9 


10 


51bs. 
6  in. 


309 


309a 


309b 


Each       $7.50          6.00          5.00 

Robervahl  Scale,  French  Make.     Cheaper,  for  coarse  weighing. 
Capacity  1  2 


Pans 
Each 


5 

5% 


10  Ibs. 

7%  in. 


3.25 


4.00 


5.00 


6.50 


$2.75 

Union  Scale,  with  two  platforms,  No.  508,  especially  convenient  for  a  large 
variety  of  uses;  capacity  from  */£  oz.  to  30  fbs.  in  the  scoop,  and  to 
240  Ibs.  on  the  platform,  which  measures  10Vaxl3%  inches.  Price, 
with  tin  scoop 15.00 

Union  Scale.     A  more  simple  form,  with  only  the  large  platform,  but  also 

with   tin    scoop    7.50 


64 


THE  DENVER  FIRE  CLAY  COMPANY. 


310 


311 


No. 

310  D.  F.  C.  Co.'s  Tin  Scoop  Scale,  with  Japanned  Weights.  Weighing  from  4 
Ibs.  to  %  oz.  Scale  is  strong  and  well  made  and  accurate;  has  brass 
beam $4.00 

310a  D.  F.  C.  Co.'s  Flux  Scale.  Like  No.  310,  with  side  beam  graduated  to  %,  oz.; 
including  set  of  japanned  weights  and  tin  scoop. 

No.  707  706  705  922 


Capacity       6 
Each          $7.75 


10 


16 


25  Ibs. 


10.00 


12.75 


20.75 


311      Troemner's   Ebony  Box  Scale,   No.  89.     With  gold  lines;    gilt  dial;    heavy 
nickel-plated  pans;   marble  top. 

No.  0  1  2 


Capacity     10 
Pans  7 


15 


25  Ibs. 
9  in. 


Each 


$12.00 


14.00 


16.00 


312 


313 


312       Hand  Scales,  s.  c.,  "Miner's  Pocket  Scale,"  in  lacquered  box,  with  set  of 
weights  down  to  %  grain,  inside  of  box,  good  bearing  and  knife  edges. 
Capacity       1  2  4  oz. 


2.50 


3.00 


Each  $2.00 

313       Hand    Scales,    with    fine   brass   beams    and    horn    pans,    suspended    by    silk 
cords,  fine  steel  bearings,  very  sensitive. 

Beam.          4  5  6  7  8  10   in. 

Pans  iy2         2  2V2         3  3%         4V2  in. 


Each 


$1.20       1.50         1.75       2.00 


2.50 


3.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


65 


316 


320a 
No. 

314  Hand   Scales,  with   Sliding   weight,  on  graduated  brass  beam,  horn   pans, 

very  delicate  and  sensitive.    No  weights  needed. 

To  weigh  5  grains,  divided  into  1-10  grains    $3.00 

To  weigh  15  grains,  divided  into  %  grains 3.50 

To  weigh  25  centigrammes,  divided  into  Vz  centigrammes...       3.00 

315  Hand  Scales,  in  box,  brass  beam  and  pans,  with  weights   .85 

316  Scale  Pans,  with  handles. 

Glass,  21/2,  2%,  3  in Pair        .40 

Nickel,  2y2,2%,3in Pair         .75 

Aluminum,  2%,  2%,  3  in Pair         .75 

317  Scale  Pans,  for  counter  scales,  nickel-plated. 

Size  6  7  8  9  10  in. 

Pair  $1.00  1.50  2.00          2.50  3.00 

318  Scale  Pans,  of  aluminum,  for  assay  balances   %-inch  diameter,  accurately 

checked    Pair      1 .00 

318a     Scale    Pans,    of    glass,  for    assay    balances    %-inch    diameter,    accurately 

checked Pair       1 .50 

319  Scale  Glass  Feet,  for  holding  leveling  screws  of  balances,  giving  perfect  in- 

sulation       Set  of  four        .40 

319a     Scale  Rubber  Pads,  for  same  purpose  Each        .20 

320  Scale  Watchglasses,  glass,  accurately  counterpoised;  for  analytic  work. 

Sizes  2%,  3,   3%   inches  diameter    Pair      1.00 

320a     Scale  Covers  of  Rubber  Sheeting.     Dust  proof.     Made  any  size  to  order. 
In  ordering  please  give  exact  measures  of  top  of  case;  also  extreme 

height    Each       1.50 

320b    Weighing  Capsule,  of  pure  nickel,  4^  inches  long   Each        .40 


66 


THE  DENVER  FIRE  CLAY  COMPANY. 


Blow  Pipe  and  Specific  Gravity  Balances 


24 


325 


No. 
321 


Plattner's  Blow  Pipe  Balance.  For  blow  pipe  analysis  sensitive  to  1  milligr. 
Nickel-plated,  with  set  of  weights  from  1  gramme  to  1  milligr.,  in  pol- 
ished wooden  case  $22.50 


322  Mohr's  Specific  Gravity   Balance.     For  both  liquids  and  solids,  with  Rei- 

mann's Patent  Thermometer,  riders,  glass  cylinder,  forceps,  also  extra 

pans  for  regular  weighings   20.00 

323  Westphal's   Specific   Gravity    Balance.     For   liquids  only,   in   polished   box, 

with  movable  support  and  Reimann's  Patent  Thermometer 15.00 

Reimann's  Thermometer    3.00 

Set  of  Rider  Weights 1.50 

324  Sartorius'   Hydrostatic   Balance.     For  specific  gravity  determination  of  li- 

quids,  complete  in   case 30.00 

325  Prof.  Jolly's  Spiral  Balance.    For  rapid  and  exact  determination  of  the  spe- 

cific gravity  of  minerals,  with  3  assorted  spirals,  on  wooden  support 

and  scale  on  mirror  glass   ...     20.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


67 


326 


No. 

326  Balance,   Hydrometer  Scale.     For  specific  gravity  weighings;    9-inch,  beam, 

5-inch  pans;   capacity  100  grammes    $6.00 

327  Balance,  Hydrometer  Scale.    With  adjustable  beam  rest  and  rod  inside  the 

pillar,  so  the  beam  can  be  raised  6  to  9  inches  higher  to  weigh  liquids 

in  cylinders.    Beam,  12  inches;  pan,  5  inches;  capacity,  500  grammes     12.00 


328 


328a 


328  Balance,  Combination.  For  regular  and  specific  gravity  weighings;  beam 
can  be  raised  on  the  brass  column.  Beam,  11  inches;  pans,  4  inches; 
column,  20  inches;  capacity,  250  grammes $  8.00 

328a  Balance,  New  "Alward"  Triple  Beam.  A  convenient,  time-saving  form  in 
chemistry  and  physics  work,  with  sliding,  non-detachable  weights, 
compactly  fitting  the  beams.  Capacity,  111  grammes.  The  upper 
beam  has  centigramme  divisions;  the  middle  beam,  1  gramme;  the 
lower  beam,  IT)  grammes.  The  sensibility  is  3  milligrammes  with  load. 
Price  complete  20.00 


68 


THE  DENVER  FIRE  CLAY  COMPANY. 


EBB 


328b 


328c 


328b  Balance,  Mohr's,  for  assaying,  laboratory  and  prescription  work;  all  brass, 
sensible  to  1-20  of  a  grain,  with  a  charge  up  to  two  pounds;  beam 
with  balancing  wires  and  prismatic  steel  bearings  $1 6,00 

328c    Ditto,  without  balancing  wires;  sensible  to  1-20  grain   15.00 


328d 

328d  Balance,  for  weighing  larger  vessels;  specially  adapted  for  making  standard 
solutions,  etc.  Beam  of  brass,  lacquered,  with  elegant  bronze  iron 
pillar. 

Capacity  1  3  5  10  Kilos. 


Dia.  of  Pans     16 


19 


22 


26  Ctm. 


Price          $10.00  12.50 

May  also  be  used  as  bullion  balance. 


15.00 


20.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


69 


Weights  of  Precision  for  Analytical,  Assay- 
ing and  Scientific  Purposes 


No. 
329 


329 


Gramme  Weights,  Ainsworth's  Button  Weights.  These  metric  weights  are 
guaranteed  accurate  subdivisions  of  the  International  Standard  Kilo- 
gramme as  furnished  by  the  Bureau  of  Standards  at  Washington. 

No.  100.  One  gramme  (platinum)  down  to  1  mg.  and  2  riders;  error  limit, 
+or—  .005  mg.  Price  ............................................ 

No.  150.  One  gramme  (platinum)  down  to  1  mg.  and  2  riders;  error  limit, 
+or  —  .01  mg.  Price  ............................................. 

No.  200.     One  gramme  (platinum)  down  to  1  mg.  and  2  riders.    Price  ..... 


329x    Thompson's  Precision  Weights.    Blue  seal  for  gold  assaying;  error  limit,  + 
or  —  .005  milligramme. 

1  gramme  (platinum)  down  to  1  mg.  and  2  riders,  per  set  ..... 

50  milligrammes  (platinum)  down  to  1  mg.  and  2  riders,  per  set 

set     .................................................. 

Thompson's  Precision  Weights.  Red  seal  for  silver  assaying;  error  limit  + 
or  —  ..01  mg. 

1  gramme  (platinum)  down  to  1  mg.  and  2  riders,  per  set  ..... 
100  milligrammes  (platinum)  down  to  1  mg.  and  2  riders,  per  set 


$25.00 

15.00 
10.00 


25.00 
12.00 
12.00 


15.00 
8.00 


329a 


329a     Gramme  Weights,  Ainsworth's  Analytical. 


No.  300  10  grammes  down  to  1  milligramme,  and  2  riders.     Price $11.00 

No.  350  20                          "            1              "                         2                        "      12.00 

No.  400  50                                        1                                        2       "               "      14.00 

No.  450  100           "                           1                                        2       "  "  16.00 


70 


THE  DENVER  FIRE  CLAY  COMPANY. 


329b 

No. 

329b    Assay  Ton  Weights,  Ainsworth's. 

No.  650     One  assay  ton  to  1-20,  brass.     Price   $4.00 

No.  700     Four  assay  tons  to  1-20,  brass.     Price   6.00 

329T    Assay  Ton  Weights,  Thompson's. 

One  assay  ton  to  1-20  4.00 

Four  assay  tons  to  1-20    6.00 

The  assay  ton  contains  as  many  milligrammes  (29,166)  as  there  are  Troy 
ounces  in  a  ton  (2,000  Its.)  avoirdupois;  hence,  if  one  assay  ton  of  ore 
yields  a  button  weighing  one  milligramme,  the  ore  carries  one  ounce  to 
the  ton. 


330 


330 


330  Gramme  Weights,  Analytical,  Imported.  Of  the  very  highest  standard  of 
accuracy  and  precision,  either  in  hinged  box  or  in  box  with  loose 
cover. 

50  grammes  down  to  1  milligramme  and  3  riders,  platinum-plated...  $15.00 

100  "  "  1  "  "  3  "  "  "...  18.00 

50  "  "  1  "  "3  "  gold-plated  ...  12.00 

100  "  "  1  "  "3  "  "  "  15.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


71 


No. 
331 


331 


Gramme   Weights,  Troemner's. 

1   platinum   gramme,   down   to   1-10   milligramme 


20 

Two     20 

50 

100 

200 

500 

1000 


1  1-10 

10  gramme  piece,  down  to  1  milligramme 


gramme    

$10.50 

specially 

checked     15.00 

1  1  .00 

12.00 

nd  3  riders    .... 

13.00 

3       " 

14.00 

3       " 

16.00 

3       " 

20.00 

3       " 

24.00 

3       "         

29.00 

332       Grain  Weights,  Troy,  Troemner's. 

10  platinum  grains,   down  to   1-100   grain    

10  1-1000     "        

100  grain  piece  down  to  1-100  grain    

1000         "         "                         1-10           "  and  3  riders 

1000         "         "           "             1-100         "  "      3       " 

1000         "         "           "             1-1000       "  "      3       " 


333 


334 


335 


336 


Assay  Ton  Weights,  Troemner's. 

4  A.  T.  to  1-20  A.  T 

1  A.  T.  to  1-20  A.  T.    . 


9.50 
10.50 
11.00 
12.00 
13.00 
14.00 


6.00 
4.00 


Milligramme   Weights,   Platinum,  Troemner's.     Single. 

Milligrammes     1000     500       200       100       50       20 

Each 


10 


$1.50    1.00      .75       .60       .40       .30      .25      .25      .25      .25 
Milligramme  Weights,   Fractional. 

Set  comprising  one  ~Vz  milligr.,  two  1-5  milligr.,  one  1-10  milligr  .... 
Riders,  Troemner's.     Single. 

Milligrammes          12  10  6  5  2  1  % 

Each  $0.25         .25  .25          .25          .40          .40          .50 


1.00 


72 


THE  DENVER  FIRE  CLAY  COMPANY. 


337 


No. 
337 


Gramme  Weights,  Becker's.  In  French  polished  boxes  lined  with  velvet, 
every  piece  fitted  separately  and  adjusted  to  the  utmost  accuracy; 
brass  weights  lacquered,  the  fractions  of  the  gramme  are  platinum, 
except  those  below  20  milligrammes,  which  are  made  of  aluminum. 


No.  1 
No.  2 

No.  3 
No.  4 
No.  5 
No.  6 
No.  7 


1  platinum  gramme,  down  to  1-10  milligramme  $10.60 

10  gramme  piece,  down  to  1-10  milligramme 12.00 


20 

50 

100 

200 

500 


No.  7A1000 


and  3    riders 

"  3 

"  3 

"  3 

"  3 

."  3 


14.00 
16.00 
18.00 
24.00 
28.00 
35.00 


338       Gramme   Weights,    Becker's    Imported. 

No.  1 
No.  2 
No.  3 
No.  4 
No.  5 


1  gramme  down  to  1-10  milligramme   9.00 

10  "       1-10          "                  11.00 

20  "       1                                and    3    riders 12.00 

50  "1                                    "     3               14.00 

100  "                   "       1  "                   "3         "  16.00 


339       Assay  Ton  Weights,  Becker's. 

4  A.  T.  to  1-20  A.  T 

1  A.  T.  to  1-20  A.  T.   . 


6.00 
4.00 


340       Milligramme  Weights,  Becker's.     Single. 
Milligramme  500     200 

Ordinary,  each  $1.25     .75 

Specially  checked,  each    2.CO    1.25 


100       50       20       10 


.75      .50      .35      .35    .35    ,.30    .30 
1.00      ,75      .50      .50    .50    .50    .50 


341       Riders,  Single,   Becker's. 

Milligrammes  12 

Each 


10 


12-10 


$0.30       .30      .30      .35      .35 


.50 


.50 


6-10 


.50 


THE  DENVER  FIRE  CLAY  COMPANY. 


73 


For  Chemical,  Pharmaceutical  and  Other 
Accurate  Purposes 


342 


346 


No. 

342 

343 

343a 
344 


345 


Milligramme  Weights,  German  Silver.     From  5  down,  of  aluminum  500  mil- 
ligrammes and  down  to  1  milligramme Set 

Gramme  Weights,  Oertling's.    In  round,  ivory  box,  screw  lid. 

One  gramme  to  1  milligramme,  with  six  1-milligramme  riders  . . .  Set 


Riders,    Oertling's.      1 
Riders,  Ainsworth's. 

Milligrammes 


milligramme 


$1.00 

12.00 
.25 


6        10 


12 


Ordinary,  each  $0.25    .25      .25      .25      .25     ,25        .25 

Special  checked,  each        .50    .50      .50      .50      .50      .50        .50 


Milligramme  Weights,  Ainsworth's,   Platinum.     Single. 
Grade       Milligrammes        1000     500       200       100       50 


20 


10 


a  Error  limit 

+  or  — .005  mg. 
b  Error  limit 

+  or  — .01  mg. 
c  Ordinary 

commercial 


Price- 


3.00 

1.50 

.85 


2.00    1.75 
1.25    1.00 


1.50 
.75 


1.251.00    1.00    1.00 
.60    .50      .50      .50 
.25 


346 


each  $5.00    4.00 
\   Price 

1    each    2.50    1.75 
\  Price 
'(    each    1.50    1.00 

Gramme  Weights,  imported;   well  adjusted. 

between  the  analytical  and  cheaper  grades,  in  polished  wooden  block, 
to  1  milligramme. 

Set  of  20  50  100  200  500  1000  grammes 

Price 


.75      .60        .40        .30    .25      .25 
A  good  quality,  which  stands 


$1.75 


2.00 


2.50 


3.50 


5.00 


7.50 


oil 

347       Gramme  Weights.    Same  as  No.  346,  but  in  polished  case,  with  hinged  cover. 

20  50          100          200          500        1000  grammes 

4^50          (TOO          7^50        10.00 


Set  of 


Price        $3^00          3^50 


74 


THE  DENVER  FIRE  CLAY  COMPANY. 


348     No.  12 


351 


No. 

348  Gramme  and  Grain  Weights,  Becker's  No.  2.     In  mahogany  box  lined  with 

black  velvet;   each  piece  fitted  separately;   brass  weights  lacquered, 
fractions  of  the  gramme  platinum. 

No.  11       50  grammes  down  to  1  milligramme $  9.00 

No.  13     100              "            "         1             "             10.00 

No.  18  1000  grains  down  to  1-100  grain 10.00 

No.  12     100  grammes  down  to  1  centigramme 5.50 

No.  15     500             "                          1                            9.50 

No.  17  1000                                        1                            12.00 

349  Gramme  Weights,  Becker's  No.  2.     In  mahogany  block. 

No.  14     500  grammes  down  to  1  gramme 6.00 

No.  16  1000                                     1                   8.50 

350  Gramme  Weights,  brass.     In  block. 

20  grammes  down  to  1  centigramme .60 

50                           '              1                           1.00 

100                                        1             "             1.50 

500                                        1  gramme 2.50 

1000                                        1         "         4.00 

2000                                          1         "          6.00 

351  Metric  Weights  of  Japanned    Iron.     Loose. 

1  kilogramme  down  to  10  gramme 1.25 

10         "         2.00 

5                                            10         "          3.50 

10                                              10          "          7.00 

352  Troy  Weights,  Brass,   Becker's.     In  mahogany  box,  linod  with  velvet.     All 

small  weights  are  of  aluminum,  fitted  separately. 

One       1  oz.  piece  down  to  ^  grain 3.50 

Two       2     "                                 14       '      6.25 

One       5                                       14       <      7.75 

One     10                                      1,4       '      10.00 

One     20     "         "                       y2       '      15.00 

One     50     "         "                       y2       '      20.00 

Two  100     "         "                        1        '      30.00 

One   200     "         "             '           1        ' 40.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


75 


oOo  o  y u 

No. 

353       Troy  Block  Weights  of  solid   brass.  In  cherry  block. 

1  oz.  down  to  y2  grain 

Two  2     "  "  y2       "     

5   "  -  y2     "    

10   -  "  i/2     "    


358 


354       Troy  Block  Weights  of  brass,  highly  finished.     In  ash  block. 


$1.00 
1.75 
2.50 
4.00 


20  oz.  down  to  y2  grain  ....................................       7.00 

30     "         "  y2       "     ....................................       9.00 

50     "         "  y2       "      ....................................      12.50 


355       Troy    Cup    Weights,    Troemner's. 
4  oz.  down  to  y± 


16 
32 
64 


1-50 
3.00 
4.00 
5.50 
9.00 


356       Aluminum  Gramme  Weights. 

1  gramme  down  to  1  centigramme... 


.Set 


.40 


357  and  360 


357  Troy  Aluminum  Grain   Weights. 

5  grains  down  to  ^  grain Set    $0.25 

358  Troy   Aluminum   Grain   Weights.     Square,   made  concave,   so  they   can  be 

picked  up  readily. 

10  grains  down  to  y2  grain Set        .40 

359  Decimal  Troy  Weights,  brass,  Troemner's. 

Set  of  4-10,  3-10,  2-10,  1-10,  5-100,  4-100,  3-100,  2-100,  1-100  oz 2.50 

360  Decimal  Troy  Grain  Weights. 

50  grains  down  to  10  grains,  nickel  silver Set        .60 


76 


THE  DENVER  FIRE  CLAY  COMPANY. 


No. 
361 


362 


363 


363-364 


Avoirdupois  Weights,  brass.     In  walnut  block. 


down  to   ya  oz $2.50 

i/s    "   3.75 

i/s    "   7.00 


Avoirdupois  Weights,  brass.  Standard  quality;  in  oiled  walnut  block,  lined 
with  poplar  to  prevent  shrinkage;  weights  of  the  finest  finish;  bur- 
nished. 

1  lb.,  down  to   1,4  oz ; 

2  "         "  14    "   

4     "  1/4    "    

Avoirdupois  Brass  Cased  Weights. 

down  to   y2  oz. . . 


1  lt>., 

2  " 
4     " 


1/2 


364       Avoirdupois  Iron   Weights.     Japanned,  loose. 

1  It).,  down  to   y2  oz 

2  "         "  1/2    "   

4     "         "  i/2    "   

8     "  1/2    "   (15  Ibs.) . 

10     "         "  y2    "   (25  Ibs.) . 


4.00 
5.50 
7.00 


1.25 
1.75 
3.00 


.75 
1.00 
1.50 
3.00 
4.00 


365       Avoirdupois  Fractions  of  Ounces,  of  nickel  silver. 
^4  oz.,  down  to  1-128  avoirdupois  oz. . 


.  Set    $0.75 


366 

366  Prescription  Weights,  of  nickel  silver  and   brass. 

2  drachms,  down  to  %  grain Set  $0.25 

6  grains                        Vz       "     Set  .10 

367  Gold  Weights.     10  pennyweights,  down  to  y2  grain Set  .50 

368  Sugar  Weights.    13.024,  26.048  or  52.096  grammes Bach  1.00 

369  Sugar  Weights.     Set  of  2,  in  lined  box,  normal  and  %  normal 2.25 

370  Sugar  Weights.   Set  of  3,  in  lined  box,  y2  normal,  normal  and  double  normal  4.50 


THE  DENVER  FIRE  CLAY  COMPANY. 


77 


BAROMETERS 


Barometers  will   be  shipped  only  at  purchaser's   risk. 


371 


373 


No. 
371 

372. 
373 
374 


Barometers,   Metal    case  weather  aneroid. 

5  inches  diameter,  with  closed  porcelain  dial $  7.00 

Same  as  above,  with  curved  thermometer 8.00 

For  altitudes  of  6,400  feet Extra  1.00 


Barometers,  Metal  case  weather  aneroid. 

5  inches  diameter,  with  open  dial,  visible  works. 


9.25 


Same  as  above,  with  curved  thermometer 10.25 

For  altitudes  of  6,400  feet Extra      1.00 


378       Barometer,  Aneroid,  first  quality,  watch  form,   1%   inches  diameter,  with 
silvered  metal  dial,  compensated  for  temperature,  in  Morocco  case. 

Revolving  altitude  scale,   8,000  feet 20.00 

Revolving  altitude  scale,  10,000  feet 21.00 

Revolving  altitude  scale,  16,000  feet 23.00 

380       Barometers,  Aneroid,  same  as  No.  378,  but  with  raised  ring  for  divisions  and 
curved  thermometer. 

Revolving  altitude  scale,    8,000  feet 22.50 

Revolving  altitude  scale,  10,000  feet 23.50 

Revolving  altitude  scale,  16,000  feet 26.00 


78 


THE  DENVER  FIRE  CLAY  COMPANY. 


No. 
381 


Barometer,  Mercurial,  improved,  Fortin  principle.  This  instrument  closely 
resembles  the  U.  S.  Weather  Bureau  Standard  Barometer  in  design 
and  method  of  operating.  The  zero  level  and  readings  are  obtained 
in  exactly  the  same  way.  The  scale  graduations  and  vernier  are  me- 
chanically equal  to  any,  and  read  accurately  to  1-10  mm.  and  1-200  in. 
Price,  with  lens  thermometer,  attached  to  board $20.00 


382 
384 

385 
386 
387 


381  385  386  387 

Barometer,  Mercurial,  on  oak  frame,  with  thermometer  attached $10.00 

Barometer,  U.  S.  Signal  Standard.     Double  scale,  graduated  in  inches  and 

millimeters  • 40-°° 

Barometer  Tubes,  plain  straight,  one  end  sealed,  35  inches  long .35 

Barometer  Tubes,  bent,  with  bulb,  one  end  sealed,  35  inches  long .40 

Barometer  Tubes,  graduated,  for  Bunsen's  syphon  barometer 3.00 


THE  DENVER  FIRE  CLAY  COMPANY.  79 


PURE 
BONE  ASH 

Made   by 

THE  DENVER  FIRE 
CLAY  COMPANY 


Many  years  ago  we  learned  that  if  we  were  to  sell  a  satisfactory  bone  ash  we 
would  have  to  manufacture  it  ourselves.  A  bone  ash  suitable  at  all  times  for  the  delicate 
work  required  in  assaying  was  not  then,  and  is  not  now,  obtainable  in  the  market,  other 
than  our  brand.  We  began  manufacturing  on  a  small  scale  in  1876;  now  our  plant  is  the 
largest  and  most  completely  equipped  in  the  world  for  making  this  specialty.  Our 
capacity  per  week  is  125  barrels.  We  sell  more  bone  ash  for  use  in  assaying  than  all 
other  dealers  or  manufacturers  combined.  The  reason  is  that  it  is  made  especially  for 
the  purpose  intended,  not  for  case  hardening,  or  other  purposes  requiring  an  inferior 
variety,  but  from  the  cleanest  of  bones,  absolutely  free  from  adulteration,  which  have 
passed  the  critical  eye  of  an  expert  sorter,  where  all  unsuitable  material  is  rejected. 

We  guarantee  our  bone  ash  to  be  the  highest  and  most  uniform  grade  manufac- 
tured. Its  tremendous  sale  is  a  source  of  much  satisfaction  to  us,  as  we  have  spared 
no  expense  in  familiarizing  ourselves  with  every  quality  it  should  have  to  give  uniform 
and  continuous  satisfaction. 

Our  bone  ash  is  made  in  three  grades,  single  X,  double  X,  and  triple  X,  put  up  in 
25-lb.,  50-lb.  and  100-lb.  boxes  and  500-lb.  barrels,  all  securely  lined  to  prevent  loss  from 
leakage,  to  meet  requirements  in  different  localities.  All  three  grades  contain  exactly 
the  same  quality  of  bones,  but  are  distinguished  from  each  other  by  a  difference  in 
fineness  of  particles,  the  single  X  being  the  coarser,  double  X  somewhat  finer,  and  the 
triple  X  grade  finer  still. 

We  do  not  specify  our  bone  ash  as  being  of  some  particular  mesh,  as  after  years 
of  experience  in  its  manufacture  we  have  found  that  any  bone  ash  running  of  an  even 
mesh  will  not  make  a  satisfactory  cupel;  the  varying  degrees  of  fineness  must  be 
present  in  their  natural  proportions  from  the  comparatively  coarse  to  the  extremely 
fine.  When  the  cupel  is  made  from  this  stock  the  interstitial  spaces  are  practically 
filled,  the  occlusion  of  air  and  moisture  minimized  (otherwise  than  by  absorption),  the 
cupel  will  be  homogeneous,  and  will  fill  its  office  without  cracking.  Practically  75  per 
cent,  of  our  X  grade  will  pass  u,  screen  aperture  of  .0147  inch  (Approx.  40  mesh),  the 
XX  .0091  inch  (Approx.  60  mesh),  and  the  XXX  .0065  inch  (Approx.  80  mesh).  After 
most  exhaustive  experiments  we  have  found  these  sizes  best  fitted  to  cover  the  general 
requirements  of  a  perfect  cupel. 

If  it  is  the  desire  of  any  of  our  customers  to  be  supplied  with  bone  ash  all  of  which 
has  passed  some  particular  screen  size,  we  are  prepared  to  fill  such  orders  with  speed 
and  accuracy,  but  will  be  compelled  to  make  a  small  additional  charge,  depending  on 
the  screen  and  size  of  the  order,  to  cover  the  additional  cost  of  its  production,  and  we 
would  ask  that  we  be  supplied  with  the  size  of  screen  aperture,  as  the  word  "mesh"  is 
more  or  less  meaningless  unless  other  specifications  as  to  size  of  wire  are  given. 

Why  not  specify  Denver  Fire  Clay  bone  ash  and  not  take  any  chances.  It  may 
be  a  trifle  more  expensive,  but  it  invariably  pays  to  get  the  best.  Inside  of  every 
package  we  send  out  is  a  brown  tag  showing  its  lot  number  and  date  of  manufacture, 
so  that  we  are  kept  in  the  closest  touch  with  the  trade  and  are  able  to  detect  the 
slightest  fault  at  once. 

We  ask  our  customers  to  preserve  these  tags,  and  any  opinions  expressed  as  to 
its  quality  will  be  deemed  a  particular  favor,  whether  in  criticism  or  praise.  We  know 
this  is  the  very  best  way  to  maintain  an  article  in  a  high  state  of  perfection. 


80 


THE  DENVER  FIRE  CLAY  COMPANY. 


BATTERIES 


401 


402 


402a 


No. 
401 


Battery,  Bunsen's.     With  rolled  zincs. 


Cell,  complete 
Parts :   Carbon 
Carbon  connection 
Carbon  clamp 
Glass  jar 
Porous  cup 
Zinc  and  connection 


403 


Size 
Jars 

1  qt. 
4x5  in. 

2  qts. 
5x6  in. 

1  gal. 
6x8  in. 

$1.20 

$1.50 

$3.00 

.10 

.20 

.40 

.20 

.30 

.60 

.10 

.15 

.40 

.25 

.30 

.40 

.15 

.20 

.30 

.60 

.70 

1.00 

402       Battery,  Crowfoot,  Gravity. 

Cell,  complete $1.00 

Parts:    Copper,  6-inch .15 

Zinc,  with  hanger  and  connector .50 

Jar,  6x8  inches   -50 


402a     Battery,  Daniell's. 

Cell,   complete 2.00 


Parts:    Copper,  with  pocket. 

Porous  Cup   

Glass  jar,  6x8  inches. 

Zinc 

Zinc  clamp 


.80 
.40 
.50 
.50 
.20 


403       Battery,  Leclanche,  "Gonda"  Cell. 

Cell,  complete 1.25 

Gondas  only 50 

Zincs  only .10 


403a     Battery,  Leclanche,  "Porous  Cup"  Cell. 

Cell,  complete 1.00 

Porous  cup  only 50 

Zincs  only .10 


THE  DENVER  FIRE  CLAY  COMPANY. 


81 


GLOBE 

Dry 

Battery 

Tl"  Globe  Dry  Bttltry  •"""*  J 
"""/for   open  circuit ««»',,; 
"ill  give  better  results  an' '" 
•"-    ^n,n7o"erDr/B^ 


"ftMUFACTUREO  Bf 

CARBON  CO- 
CLEVELAND,  °- 


405 


405a 


No. 

404 


405 


Battery,  Grenet.     French  form. 

Capacity  %  pt. 


1  pt. 


gal. 


Cell,    complete  $1.20 

Parts:    Carbons,  each        .20 


Zinc 


.15 


$1.80 

.30 
.20 


$2.50 

.40 
.25 


$4.00 

.50 
.30 


gal.  double. 


$6.00 

.50 
.30 


Battery,  Samson  No.  2. 

Cell,   complete  .............................................     $1.50 


Parts :     Carbon  vase 

Zinc,  cylindrical 

Glass  jar 

Rubber  cover 

Cork  stoppers  for  re-plugging  carbon. 


405a     Battery,  "Globe"  Dry  Cell.     Very  efficient 

405b     Battery,  "Columbia"  Dry  Cell  No.  6.    Size  2%x7  inches,  of  superior  quality. 

405c     Battery,  "Ever  Ready"  Dry  Cell.     Size  2%  x  Ql/2  inches,  the  best  made 


1.00 
.25 
.25 
.15 
.05 

.30 
.40 
.50 


82 


THE  DENVER  FIRE  CLAY  COMPANY. 


406a 


406b 


No. 

406 


(a) 


(b) 


Batteries,   Edison   Primary.     The  most  economical  and  convenient  battery  on  the 
market.    Its  advantages  are: 

1st.    High  and  constant  available  electromotive  force. 

2nd.     No  local  action,  and  therefore  no  loss  of  energy  while  the  cell  is  idle — the 
chemical  action  in  cell  is  less  than  1  per  cent,  per  month. 

3rd.    Extremely  low  internal  resistance. 

4th.     Heavy  current  delivery,  absolutely  constant. 

5th.    Cheap  materials  easily  obtained. 

6th.     No  attention  or  inspection  required  until  all  the  energy  of  its  elements  is 
exhausted. 

7th.    Convenience  of  form  and  freedom  from  noxious  fumes  or  chemical  deposits. 
No  creeping. 

8th.     No  polarization. 

9th.    Will  not  freeze  at  lowest  temperature. 

10th.     The  Edison  Primary  Battery  is  made  in  several  different  types,  each  one  of 
which  is  specially  designed  for  the  kind  of  work  named. 

Type  B.  B.  Cell,  Small  Gas  Engine  Model.    Capacity  100  ampere  hours.   Com- 
plete cell,  with  porcelain  jar  Net 


Price  of  renewal  parts: 

1  Copper  Oxide  Plate  (capacity  1  charge) 

1  Zinc  Plate  (capacity  1  charge)    

Can  containing  1  charge  Caustic  Soda 
Bottle  Special  Battery  Oil   (1  charge)    .  . . 


Type  Q  Cell,  Small  Fan  Motor  Model.     Capacity  150  ampere  hours.     Com- 
plete Cell,  with  porcelain  jar  Net 

Price  of  renewal  parts: 

2  Zinc  Plates  (capacity  1  charge)  14c  each  

1  Copper  Oxide  Plate  (capacity  1  charge)    

Can  containing  1  charge  Caustic  Soda   

Bottle  Special  Battery  Oil  (1  charge)    


$1.50 

.24 
.28 
.15 
.05 

2.20 


.28 
.31 
.17 
.06 


THE  DENVER  FIRE  CLAY  COMPANY. 


83 


406c 


406d 


406e 


(c)  Type  R.  R.  Cell,  Large  Gas  Engine  and  Railroad  Crossing  Model.     Capacity 

300  ampere  hours.     Complete  cell,  with  porcelain  jar Net    $2.90 

Price  of  renewal  parts: 

2  Zinc  Plates  (capacity  1  charge)  25c  each  .50 

1  Copper  Oxide  Plate  (capacity  1  charge)    .55 

Can  containing  one  charge  of  Caustic  Soda  '       .28 

Bottle  Special  Battery  Oil  (1  charge)    07 

(d)  Type  S  Cell,  Phonograph  Model.     Capacity  300  ampere  hours.     Complete 

cell,  with  porcelain  jar Net      3.00 

Price  of  renewal  parts: 

2  Zinc  Plates  (capacity  1  charge)  25c  each  .50 

2  Copper  Oxide  Plates  (capacity  1  charge)  31  c  each 62 

Can  containing  1  charge  of  Caustic  Soda  .28 

Bottle  Special  Battery  Oil   (1  charge)    06 

(e)  Type  W  Cell,  Large  Motor  and  Cautery  Model.     Capacity  600  ampere  hours. 

Complete  cell,  with  porcelain  jar Net      4.85 

Price  of  renewal  parts: 

2  Zinc  Plates  (capacity  1  charge)  41  c  each 82 

2  Copper  Oxide  Plates  (capacity  1  charge)  55c  each 1.10 

Can  containing  1  charge  Caustic  Soda   .52 

Bottle  Special  Battery  Oil  (1  charge) 08 


84 


THE  DENVER  FIRE  CLAY  COMPANY. 


408 


409 


409 


409a 


No. 

407  Battery  Jars.    Round,  of  glass,  best  make. 

Width 

Height 

Each 

408  Battery  Cells. 

Width 

Height  

Each   $<X15 AS        !20 [22 !25~ 

409  Battery  Connections,  Binding  Screws.     Finished. 

Size Single  Double 


4 

4^ 

i       5 

5 

6 

6 

8% 

9  in. 

4 

5 

6 

7 

6 

8 

12 

15  in. 

.$0.20 

.25 

.30 

.40 

.40 

.50 

1.25 

1.75 

s.     Porous, 

round 

cups. 

2 

2% 

3 

3 

3  in. 

3 

41/ 

5% 

5% 

7 

Sin. 

/& 

.30 


409a 


Each $0.10 

Battery  Connectors,  brass,  double. 


.15 


$0.20 


410 


410a 


410b 


410c 


410 


410a 


410b 


410c 


Battery  Double  Connector.     For  two  wires. 

Size Small  Large 


Each $0.05 


.10 


Battery  Binding  Post.    American  pattern. 

Size  ..  Small  Medium 


Large 


Each $0.05 


.08 


.10 


Battery  Binding  Post,  with  wood  screw. 

Size Single  Double 


Each $0.15  .20 

Battery  Binding  Post,  double,  with  plate  to  screw  to  table Each    $0.35 


THE  DENVER  FIRE  CLAY  COMPANY. 


85 


BEAKERS 


412 


413 


414 


Note: — Our  beakers  are  equally  thin  at  the  bottom  and  sides,  and  thoroughly 
annealed.  They  are  made  according  to  the  formula  of  the  late  Prof. 
Weber,  of  Charlottenburg.  This  glass  is  of  high  resistance  to  the 
action  of  water  and  chemicals,  and  has  proven  of  equal  practical  use 
as  Jena  glass. 

We  offer  to  our  customers  this  glass  of  very  superior  quality  at  the  follow- 
ing prices,  which  will  be  found  to  be  no  higher  than  the  price  of  the 
ordinary  Bohemian  glass. 

No. 

411       Beakers,  Bohemian  Style,  plain  form.     "Resistance  Glass." 
Single:     No. 

Capacity 

Each 

No. 

Capacity 


000    00 
Vz     1 

0 
1% 

1     2 
3%   5 

3     4 
8    12  oz. 

$0.05  .07 
5     6 
18    24 

.08 

7 
34 

.10   .12 

8     9 
50    70 

.17   .22 

10 
80  oz. 

$0.25   .30 

.35 

.40   .55 

.65 

412 


Each 

Beakers,  Bohemian  Style,  plain  form;  in  nests.     "Resistance  Glass." 
Nests :     No.  000  to  0  in  nests  of  3,  capacity  y2  to    2  oz . 


0 
1 
1 
1 
1 
1 
1 
1 
1  10 


10, 


2 

5  oz  

3 

8  oz  

1 

12  oz.  . 

3 

18  oz  

3 

24  oz  

3 

34  oz  

1 

50  oz  

1 

70  oz  

3 

80  cz.  . 

Nest 


$0.20 

.30 

.35 

.55 

.70 

1.00 

1.35 

1.60 

2.10 

2.75 


412a 


412b 


Beakers,  plain  form,  for  electrolytic  copper  determination,  110  mm.  high,  47 

mm.  at  bottom,  65  mm.  at  top,  each  $0.20 Dozen      2.00 

Beakers,  usual  high  form,  like  411  and  412,  but  with  lip. 

No.  000         00         0         1         2         3         4         5         6         7 

Each 


$0.05        .07      .08      .10      .12      .17      .22      .25      .30      .35 


413       Beakers,   Bohemian  Style,  Griffin's,  lipped  form.     "Resistance  Glass." 


No. 

Capacity 

000 

00 

0 
2% 

1 
5 

2 
8 

3 
13 

4 
20 

5 
28  oz. 

Each 
No. 

Capacity 

$0.07 
6 
36 

.09 
7 
48 

.10 
8 
62 

.12 

9 
80 

.18 

10 
96 

.25 

11 
112 

.30 

12 
144  oz. 

.40 

Each 


$0.50        .60        .70        .80        .90      1.00      1.20 


86 


THE  DENVER  FIRE  CLAY  COMPANY. 


415 


415a 


416-417 


No. 
414 


Beakers,  Bohemian  Style,  Griffin's;   in  nests.     "Resistance  Glass.' 

Nests:     No.  000  to    0,  in  nests  of  3,  capacity   y2  to    3  oz.. 


2 
2 
3 
4 
5 
6 
8 

10 
12 


3, 

2, 

3, 

4, 

5, 

6, 

8, 

10, 

12, 


414b     Beakers,  Jena  Glass,  Griffin's  form,  lipped. 
Capacity     100         150         250         400 


600 


Each        $0.15 


.20 


.25 


.30 


.35 


415       Beakers,  Royal  Berlin  porcelain,  glazed,  plain. 


No.  1 

Capacity       6 
Each       $0.50 


2 
12 


3 

20 


.75 


1.CO 


4 

32  oz. 
1.40- 


415a     Beakers,  Royal   Berlin  porcelain,  glazed,  lipped. 
123 


No.  1 

Capacity       4 

Each       $0.40 


4 
12  oz. 


416 


417 


.50          .60          .70 
Beakers,  Copper,  Griffin's  form,   lipped. 

Capacity       4  8  16  32  oz. 


Each 
Each 


$0.55 
.70 


.75 
.90 


1.00 
1.20 


3 

8 

5 

8 

5 

13 

5 

20 

5 

28 

5 

36 

5 

62 

5 

96 

5 

144 

800 


1000  cc. 


.50 


1.25  Plain. 

1.60  Nickel-plated. 


Beakers,  Aluminum,  Griffin's  form,  lipped. 

Capacity       4  8  16  32  oz. 


Each       $0.60 


$0.25 

.35 

.30 

.50 

.80 

1.10 

1.50 

2.50 

3.50 

5.00 


.80        1.20 


1.60 


THE  DENVER  FIRE  CLAY  COMPANY. 


87 


BELL  GLASSES 


426 


427 


Xo. 
421 


422 


423 


424 


425 


426 


427 


These  Bell  Glasses  have  a  strong  rim  at  the  bottom,  and  are  ground  for  use 

with  the  air  pump. 
Bell  Glasses,  low  form,  with  knob. 

Height  iy2         214         3%         4  5  5  8  10  in. 

Dia.  3  4  5  6  7  8          10  12  in. 


Each 

$0.45 

.60          .75 

1.00 

1.20 

1.50 

2.00          3.W 

Bell  Glasses,  tall  form, 

,  with 

knob. 

Height 

6 

8 

9 

11 

14 

15 

15  in. 

Dia. 

3 

4 

5 

6 

6V2 

7 

8%  in. 

Capacity 

pt. 

qt. 

V2 

1 

iy2 

2 

3  gal. 

Each 

$0.50 

.70 

.90 

1.20 

1.40 

1.75 

3.00 

Bell  Glasses,  cpen  top, 

wide 

opening. 

Height 

6 

8 

9 

11 

14 

15 

15  in. 

Dia. 

3 

4 

5 

6 

6V2 

7 

8y2  in. 

Capacity 

pt. 

qt. 

y2 

1 

iy2 

2 

3  gal. 

Each 

$0.50 

.70 

.90 

1.20 

1.40 

1.75 

3.00 

Bell  Glasses,  open  top,  narrow  neck  for  receiving  brass  cap  or  stopper. 

Height  68  9          11          15  in. 

Dia.  3  4  5  6  7  in. 

Capacity  pt.        qt.  y2 1 iy2         2  3  gal. 

Each          $0.50          .70          .90        1.20        1.75 
Bell  Glasses,  swelled  form,  witn  knob. 
Capacity          qt.  y2  1  gal. 

Each  $0.70          .90        1.20 

Bell   Glasses,  tubulated,  with  opening  on  top  and  tubulature  on  side  near 
bottom,  for  use  with  filtering  pump. 
Height  8  10  in. 

Dia.  6  8  in. 

Each         $1.50        2.50 

Bells,  Electric,  iron  box,  nickel-plated  gong. 
Size  2y2  3  4  in. 

Each          $0.40          .50          .60 
Push    Buttons,  walnut Each     $0.15 


88 


THE  DENVER  FIRE  CLAY  COMPANY, 


BLAST  LAMPS 


431 


432 


433 


No. 

431       Blast  Lamp;  with  safety  valve,  of  copper.    For  alcohol,  giving  a  horizontal 

flame   .  $3.00 


432       Blast  Lamp;  of  copper.    For  alcohol,  giving  a  vertical  flame. 

Small   size 

Large   size 


2.00 
3.00 


433       Blast  Lamp,  Barthel's.    For  gasoline,  on  stand,  revolves  so  as  to  give  both 

vertical  and  horizontal  flame,  excluding  any  danger  of  explosion 8.00 


434a 


434       Blast  Lamp,  Bunsen's.     For  gas,  most  improved  form,  complete $3.50 

434a     Blast  Lamp,  Bunsen's.     For  gas,  extra  large  and  powerful 7.50 


THE  DENVER  FIRE  CLAY  COMPANY. 


89 


435 


435a 


436 


No. 
435 

435a 


436 
437 

437a 
437b 
437c 
437d 


Blast  Lamp,  Wiesnegg's.     French  form,  for  gas,  mounted  on  ball  joint $4.00 

Blast  Lamp,  Turner's  Gasoline  Laboratory  Torch,  brass,  nickel-plated,  capac- 
ity one  pint,  with  swiveled  burner,  can  be  lighted  with  a  match 5.00 

Blast  Lamp,  Fletcher's.     With  upright  blast 3.50 

Blast  Lamp  Accessories,  used  with  Fletcher-Plattner  blow  pipe  furnace  for 
capsules  or  crucibles. 

Blow  pipe  furnace,  with  bottom  or  side  hole  and  1  crucible 

Clay  crucibles,   %-in.  dia Doz. 

Clay  capsules Doz. 

Furnace  support;    to  go  on  436 


.25 
.20 
.20 
.60 


437d 

438       Blast  Lamp;  Fletcher's  Compound  Blow  Pipe,  for  glass  workers  and  experi- 
mental laboratories,  very  powerful Each    $7.50 


90 


THE  DENVER  FIRE  CLAY  COMPANY. 


BLOWERS— BELLOWS 


441 


442 


No. 

441       Blowers;    Fletcher's  Foot  Bellows.     Giving,  a  continuous  blast  of  air. 

No.  1,  small 

Dia.  7% 

Each         $4.00 


2,  medium 

10 
5.00 


3,  large 
11  in. 
7.00 


442       Blowers;   Foot  Bellows,  mounted  on  legs. 


No. 

Dia. 

Each         $5.00 


4,  small 

7% 


5,  medium 
10 


6,  large 
11  in. 


6.00 


8.00 


Note: — The  Nos.  1  and  4  Bellows  have  a  single  disk;  the  Nos.  2  and  - 
5  two,  and  the  Nos.  3  and  6  three  disks. 

443  Blcwers;    Extra  Rubber  Disk  for  Nos.  1  or  4,  9  inches Each     $0.60 

"     "         2  or  5,  12  inches Each         .90 

"     "         3  or  6,  15  inches Each       1.35 

444  Blowers;    Extra  Nets  for  above 40 

445  Blowers;    Root's  Positive  Pressure,  *4  B.  S Net     20.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


91 


Patented  High  Pressure  Blower 


Adapted  for  use  with  gas,  oil,  coal  or 
wherever  a  steady  blast  is  required  under 
a  pressure. 

These  blowers  will  deliver  a  greater 
volume  of  air  with  higher  pressure  than  any 
blowers  of  equal  size  now  on  the  market. 

Simply  constructed  and  have  no  deli- 
cate parts  to  wear  out  or  cause  trouble. 
All  parts  are  interchangeable,  and  can  be 
duplicated  at  small  cost.  Does  not  require 
the  services  of  a  mechanic  to  take  the  ma- 
chine apart  or  assemble  it. 

Runs  noiseless  in  operation  whether 
new  or  old  and  without  vibration. 

They  run  at  a  slow  speed  and  require 
very  little  power  to  drive  them. 

All  sizes  but  A  are  furnished  with  a 
relief  valve  to  regulate  the  pressure,  and 
all  with  the  exception  of  size  A  and  B  are 
furnished  with  an  air  tank.  Inlet  pipe 
and  screen  is  furnished  with  sizes  D,  E, 
F  and  G. 


The  following  are  a  few  of  the  purposes  for  which  these  blowers  are  now  in  use. 


Melting  of  Metals, 
Hardening, 

Annealing, 
Sand   Blasting, 

Fuel  Oil  Plants, 

Glass  Blowing  and   Bending, 
Tempering, 
Forging, 

Brazing, 


Removing   Paint, 
Atomizing, 

Heating,  Ventilating, 
Soldering, 
Cleaning, 

Agitating  Liquids, 
Pneumatic  Service, 

Testing  Gas  Fixtures, 
Burning   Brands. 


fe 

«J 

i/S 

PH 

1 

Ii 

h'B 

g     , 

-a 

C 

43 
Bj 

_o 

11 

02  g_ 

*8 

Li 

'B 

PH 

1  2 

o  a 

"3 

1 

pp 

^  8, 

ll 

J 

o 

PH   S 

•&    O 

" 

2 

co 

w 

S3 

•§"8 

J?     LH 

"R  "5 

ii 

I 

3 

1 

I1 

3 

w 

.s 

_o 

s 

PH 

A 

17 

600 

4 

1 

1-10 

10 

i" 

20 

lOx  6 

$       23.00 

B 

30 

600 

4 

H 

i 

10 

r 

26 

12x  8 

30.00 

C 

80 

400 

5 

2 

i 

10 

1  " 

43 

15x10 

45-00 

D 

200 

300 

7 

2^ 

10 

H" 

76 

19x15 

55  oo 

E 

400 

250 

12 

3" 

1 

10 

ly 

153 

24x18 

65.00 

F 

675 

200 

12 

3 

H 

10 

2  " 

250 

28x22 

90.00 

G 

1400 

200 

14 

3 

2| 

10 

2V' 

400 

31x24 

i  50  .  oo 

92 


THE  DENVER  FIRE  CLAY  COMPANY. 


448 


449 


No. 

447  Blowers;    Richard's  Waterblast.     Direct  connection  is  made  with  Richard's 

filter  pump,  producing  simultaneously  vacuum   and  blast.     Without 
filter  pump    $  7.50 

448  Blowers;   Richard's.     Complete  with  filter  pump   9.00 

449  Blowers;    Muencke's  Waterblast  and    Exhauster.     Nickeled  brass,  with  air 

outlet  and  water  regulating  stopcock 10.00 

With  Vacuum  Gauge,  $5.00  extra. 


450 


450a 


450       Blowers;   Hand  Bellows,  10-in.  diameter,  good  grade $1.50 

450a     Blowpipe,  Oxy-hydrogen,  with  adjustable  holder  for  lime  cylinder;  of  brass, 

like  sketch,  but  with  2  stopcocks 7.50 


THE  DENVER  FIRE  CLAY  COMPANY. 


93 


BLOW  PIPES 


452-3 


454-5 


No. 

451 
452 
453 
454 

455 


Blow  Pipe;  Fletcher's  Automaton  No.  6A.     On  stand $4.00 

Blow  Pipe;  Fletcher's  Automaton  Hand  No.  6B.     For  %-in.  gas  pipe 3.50 

Blow  Pipe;    Fletcher's  Automaton  Hand  No.  6C.     For  %-in.  gas  pipe 5.00 

Blow  Pipe;   Fletcher's  No.  6D.     Automaton  6B  on  stand 4.00 

Blow  Pipe;  Fletcher's  No.  6E.     Automaton  6C  on  stand 5.50 

Note:  No.  6B  and  6C  Automaton  Hand  Blow  Pipe  will  be  found  a 
most  convenient  pattern  for  small  work,  brazing,  annealing,  etc. 
The  No.  6B  requires  a  %-bore  gas  pipe  and  tap.  The  No.  60  re- 
quires for  its  fullest  power  a  %-in.  clear  bore  gas  pipe  and  tap.  The 
No.  6B  requires  Blower  No.  9A;  No.  60  requires  Blower  No.  9B. 


456 


457 


No. 

456  Blow  Pipe;   Fletcher's  New  Patent  No.  42.    With  both  cold  blast  and  patent 

hot  blast,  two  jets,  nickel-plated  mouth-piece $1 .50 

457  Blow  Pipe,  Fletcher's  No.  32A.     As  illustrated,  complete  5.00 


94 


THE  DENVER  FIRE  CLAY  COMPANY. 


466  and  468 


470a 


No. 

458  Blow  Pipe;   for  brazing  work.     With  stopcocks $2.00 

459  Blow  Pipe;    Fletcher's  No.  30.     Taper  shaft,  brass 65 

460  Blow  Pipe;    Fletcher's  No.  30A.     Straight  shaft,  brass 55 

461  Blow  Pipe;    Fletcher's  No.  SOB.     Straight  shaft  with  mouth-piece .75 

462  Blow  Pipe;    Fletcher's  No.  30C.    Jointed  with  both  hot  and  cold  blast  jets.  .  1.00 

464  Blow  Pipe;   Fletcher's  Hot  Blast  Chemical  No.  31.     With  mouth-piece 1.25 

465  Blow  Pipe;   Jeweler's  Form.     Brass,  with  air  chamber .20 

466  Blow  Pipe;   Jeweler's  Form.     Brass,  without  air  chamber .15 

467  Blow  Pipe;   Jeweler's  Form.     Nickel-plated,  with   air  chamber .25 

468  Blow  Pipe;   Jeweler's  Form.     Nickel-plated,   without  air  chamber .20 

468a     Blow  Pipe;   School  of  Mines  Pattern.     With  moisture  trap,  made  of  brass, 

with  bone  mouth-piece .50 

469  Blow  Pipe;   Plattner's.     Nickel-plated,  with  mouth-piece  and  platinum  tip..  3.00 
469a     Blow  Pipe;   Plattner's.     Nickel-plated,   with   hard   rubber   mouth-piece   and 

blast  attachment  for  gas 2.50 

470  Blow  Pipe;    Berzelius'.     Brass,  with  mouth-piece  and  platinum  plate 1.50 

470a     Blow  Pipe;   Black's  Conical  Form.     With  movable  brass  tip .20 

471  Blow  Pipe;  Jet  Tips.    Brass  for  all  Fletcher's  mouth  blow  pipes Each  .10 

472  Blow  Pipe  Tips.     Pure  platinum,  for  Plattner's  blow  pipes  "  1.25 

472a     Blow  Pipe  Tips.     Brass  for  Black's  blow  pipes  .05 

473  Blow  Pipe   Mouth   Pieces.     Hard  rubber,  trumpet  shaped,  large    .35 

474  Blow  Pipe  Mouth   Pieces.     Horn,  small "  .25 

Blow   Pipe  Goods,  Chemicals  and    Reagents,  according  to  Prof.   Plattner's. 

For  a  full  line  of  these,  refer  to  Index,  under  aforesaid  names. 


THE  DENVER  FIRE  CLAY  COMPANY. 


95 


BOTTLES 

For  General  Use,  for  Specific  Use  and  for  Reagents 


No. 

501 


503 


505a 
506 


507 


508 


508 


Bottles;   narrow  mouth.    Flint  glass;  s.  c.     "Prescriptions." 

Capacity       1          2         4         8         12          16          32  oz. 


Doz.  $0.25      .30      .40      .60        .75 

Capacity          V2         1         2        5  gal. 

Each 


.90 


1.40 


.35      .80 


1.50 


$0.25 

502       Bottles;  wide  mouth.    Flint  glass;  s.  c.    "Powder  Bottles." 

Capacity         V2         1  2         4         8         12         16 

Doz.             $0.25      .30  .35      .40      .60        .80      1.00 

Bottles;  wide  mouth.     Green  glass.  For  ore  samples,  etc. 

Capacity          4  oz.  ^  gal.            1  gal. 
Gross 


32  oz. 


1.50 


2  gal. 


$4.00         Each  $0.25 

504       Bottles;  extra  wide  mouth.     Flint  glass. 

Capacity          1        2         4  oz. 

Doz. 


.40 


.90 


,40 


.50 


$0.35 

505       Bottles;   extra  tall.     For  oil  samples  and  other  liquids. 
Capacity  2         4         8  oz. 

$0.50 


Doz.  $0.50      .90         1.20 

Bottles;   oil  sample,  long,  with  nickel-plated  screw  cap,  cork  lined,  4  oz.,  Doz.    $1.50 

Bottles;   homeopathic  vials,  with  patent  lip. 

Capacity  %  1  2  3  4  6          8  drms. 

Gross  $0.80        .90      1.00      1.20      2.00      3.00      4.00 


Bottles;  with  nickel  screw  caps.    Round. 
Capacity  124 


8  drms. 


Doz. 
Gross 


$0.25      .30      .40 
2.00    2.50    3.50 


.50 
5.00 


Bottles;    glass  stoppered;   s.  c.  "Specimen  Bottles." 

Capacity          1        2        5        10  grammes 
Doz.  $0.50      .60      .70        .80 


96 


THE  DENVER  FIRE  CLAY  COMPANY. 


509 


510 


511 


512 


No. 

509 


"Tinctures." 
16        32  oz. 


509a 


Bottles;  glass  stoppered.  Flint  glass,  narrow  mouth;  s.  c. 
Capacity          1        2        4        6        8        12 
Doz.    "        $1.00    1.20    1.40    1.60    1.80      2^00      2^50      3.50 

Bottles;   glass  stoppered.     "Tinctures,"  same  as  No.  509,  but  of  amber  glass. 
Capacity  1         2         4         8         16         32  oz. 

Doz. 


$1.20    1.40    1.60    2.00      3.00 


4.00 


510       Bottles;  glass  stoppered. 


511 


511a 


512 


Capacity      12  oz.        1  pt.        1  qt.        %  gal.        1  gal.        2  gal. 

Each             $0.15           .20          .25               .35              .50          1.00 
Bottles;  mushroom  stopper,  narrow  mouth;  s.  c.    "Tinctures." 
Capacity           1          2          4          8        16        32  oz.     %        1        2  gal. 

Doz. 

$1.00      1.25      1.50      2.00      2.50     3.00       5.00     7.50     15.00 

Bottles,  same  as  No.  511,  but  of  amber  glass,  for  solutions. 
Capacity          %        1        2  gal. 

Each  $0.60      .75      1.50 

Bottles;  mushroom  stopper,  wide  mouth;  s.  c.  "Salt  Mouths." 
Capacity  1  2  4  6  8  12  16 
Doz. 


32  oz.  M:  gal. 


$1.10     1.30     1.50     1.70     2.00     2.25     2.75     3.50       5.00 


513 


514 


515 


513  514  515 

Bottles;  Aspirator.    With  narrow  outlet  near  bottom  for  rubber  tubing. 
Capacity    4  oz.     8  oz.    pt.     qt. 
Each          $O35      AO      .50     .70 

Bottles;  Aspirator.  With  wide  outlet  near  bottom. 
Capacity  qt.  V2  1  2  gal. 
Each 


.90    1.50 


2.50 


$0.70 

Bottles;  Aspirator.     With  glass  stopper  and  glass  stopcock  ground  into  tubulature. 
Capacity_      pt.        qt.         ^          1  4          8  gal. 

Each  $1.80       2^00       2T50       3.50     6.00     10.00     20.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


97 


516 


517 


519 


520a 


No. 

516  Bottles,  Balsam.    With  glass  cap  and  loose  fitting  stopper,  capacity  1  oz. 

517  Bottles,  Cobalt.     With  ground  in  rod  stopper,  capacity  1  oz 

518  Bottles,  Cobalt.    With  ground  on  glass  cap,  and  long  stopper. 


$0.30 
.25 


Capacity 
Bach 


4oz. 


$0.35      .40      .50 


519       Bottles,  Coin  or  Acid  Test. 
Capacity        1 
Each 


2oz. 


.40 


$0.30 

520       Bottles,  Compressing,  Lintner's.   For  conversions  and  digestions,  cap'y  4  oz.        .50 
520a     Bottles.     Same  as  No.  520,  but  with  frame  2.00 


521a 


521        Bottles,    Dropping. 


522 


523 


524 


525 


521a     Bottles, 
522       Bottles, 


With  pipette  stopper  and  rubber  bulb,  capacity  1  oz. 

capacity  2  oz. 

Dropping,  Ranvier's.  With  pipette  stopper  and  ball  top. 

Dropping,  Schuster's.  With  stopper.                              capacity  1  oz. 

Capacity          1  2  oz.                                           capacity  2  oz. 

Each 


$0.20      .25 

523  Bottles,  Dropping,  "Patent  Dropper." 

Capacity        Vz        1        2  oz. 
Each          $0.20     ^25 130 
523a     Bottles,  Dropping,  "Patent  Dropper."     Amber  colored,  capacity  1  oz.. 

524  Bottles,  Dropping  or  Acid  Bottle.    With  ball  stopper. 

Capacity          1        2_oz. 
Each          $0.45      ^6~ 

525  Bottles,  Mixing.    Graduated  and  glass  stoppered. 

Capacity          250        500        1000        2000  cc. 
Each  ~          $TOO 1T50         2^6 4.00 


$0.20 
.30 

.30 
.40 


.25 


98 


THE  DENVER  FIRE  CLAY  COMPANY. 


534 


Bottles,  Specific  Gravity,  unadjusted,  for  self  adjustment,  perforated  stopper. 
Capacity  10         25         50         100  cc. 

Each 


$0.25 


.30 


.40 


.50 


527       Bottles,  Specific  Gravity,  accurately  adjusted,  perforated  stopper. 
Capacity          10        25        50        100  cc. 
Each  "" 


$0.50        .70 


.90 


1.10 


528 


529 


530 


531 


532 


533 


Bottles,  Specific  Gravity,  with  thermometer  ground  into  neck. 
Capacity          25        50        100  cc. 
Each  ~         $1^5      2TOO  ~~ 


Bottles,  Specific  Gravity,  Geissler's,  with  thermometer  ground  into  neck,  and  cap- 
illary side  tube. 

Capacity  10        25        50  cc. 

Each  "$2£5~     2.50     STOO 

Bottles,  Specific  Gravity,  same  as  No.  527,  with  tare  weight,  in  lacquered  tin  box. 

Capacity  10         25         50         100  cc. 

Each  ~  $1.25      TT50      2^00        2^50 

Bottles,  Specific  Gravity,  same  as  No.  528,  with  tare  weight,  in  lacquered  tin  box. 

Capacity  250         500         1000  grains. 
Each 


(1.50        1.75 


2.00 


Bottles,  Specific  Gravity,  Regnault's.     With  wide  mouth  for  so! ids. 
Capacity  25         50  cc. 

Each 


$0.50 


.60 


Bottles,  Specific  Gravity,  Regnault's.     With  narrow  mouth  for  liquids. 
Capacity  25         50  cc. 

Each 


$0.40        .50 
533a     Bottles,  Specific  Gravity,  Sprengel's,  plain  U  shape  with  suction  tube,  each     $0.75 

534       Bottles,  Wash  Bottles;   Fresenius.     Complete  with  rubber  stopper. 
Capacity_        4         8         12         16         24         32  oz. 
Each  $035      AO       A5 .50        i60 ~.75~ 


THE  DENVER  FIRE  CLAY  COMPANY. 


99 


535 


536 


537 


538 


539 


No. 
535 


536 


537 


538 


539 


Bottles,  Wash  Bottles;   Drechel's.    All  glass. 

Capacity          8        16        32  oz. 

Each          $1766 1.25      1.50 
Bottles,  Wash  Bottles;    Langbein's;  with  two  glass  stopcocks. 

Capacity  8         16  oz. 

Each 


2.75 

Wide  mouth  and  ground  hollow  stopper. 
50         50         65         75         100mm. 
30         40         12         15  25mm. 


$2.50 
Bottles,  Weighing,  for  filters. 

Height  50 

Dia.  20 

Each  ~        $0.25        730 740 725 730 
Bottles,  Weighing,  Conical  Form,  with  light  stopper. 

Capacity          1        2        4  oz. 

Each  $0.40      ^50 760 

Bottles,  Weighing,  two  tubes,  one  fitting  into  the  other. 

Length  70        75         80mm. 

Dia.  15         20         25  mm. 

Each 


.40 


$0.20        .25 


.30 


540 


541 


542 


540  541 

Bottles,  Woulff  Bottles,  with  two  necks. 

Capacity          *4         Vz         1  pt. 
Each  16740        .45         755~ 

Bottles,  Woulff  Bottles,  with  three  necks. 
Capacity          *4        %        1  Pt. 
.50 


542 


Iqt. 


54  2a 


2  gal. 


.85       1.25     2.25     4.00 


Iqt. 


1 
"2750" 


2  gal. 


542a 


Each  $0.45        .50         .60  .95       1.40     2.50     4.50 

Bottles,  Woulff  Bottles,  with  three  necks  and  tubulature  near  bottom. 

Capacity          1  pt.        1  qt.         %         1        2  gal. 

Each    •  $0.90         T720       T775 2.75     5.00 

Bottles,  De-aerating,  as  used  in  sugar  factories,  for  separating  the  air  from 
the    juice    Each 


$2.00 


100 


THE  DENVER  FIRE  CLAY  COMPANY. 


Reagent  Bottles  with  Ground  Glass  Labels 


N.  B.  These  bottles  have  the  chemical  names  and  equivalents  in  raised  letters  ground 
on  the  surface.  They  are  made  from  glass  containing  no  lead,  zinc  or  other  metallic 
flux. 

Please  order  by  numbers. 

Note:  —  Any  names  not  on  the  list  can  be  engraved  on  the  bottles 
at  small  extra  charge. 


No. 

543       Reagent  Bottles. 

No. 

1.  Hydrogen  Sulphide  (Amb.).H2S 

2.  Hydrochloric  Acid HC1 

3.  Acetic  Acid HC2H3O, 

4.  Sulphuric  Acid H2SO4 

5.  Nitric  Acid HNO3 

6.  Potassium  Ferrocyanide . . .  K4Fe(CN)6 

7.  Potassium  Sulphocyanide.  .KCNS 

8.  Potassium  Carbonate K2CO3 

9.  Potassium  Sulphate K,SO4 

10.  Potassium  Iodide KI 

11.  Potassium  Ferricyanide K8Fe(CN)0 

12.  Potassium  Hydroxide KOH 

13.  Potassium  Bichromate K2Cr2O, 

14.  Sodium  Phosphate Na2HPO, 

15.  Ammonium  Hydroxide NH4OH 

16.  Ammonia  Sulphide  (Amb.)  .(NH4),S 

17.  Ammonium  Chloride NH4C1 

18.  Ammonium  Carbonate (NH4).,CO3 

19.  Ammonium  Oxalate (NH4),C,O4 


Capacity,  %  pt.  =  4  oz.  =  125  cc.   Height,  5*4  in.,  Doz.,  Net  $1.75 


No. 

20.  Barium  Chloride BaCL 

21.  Calcium  Chloride CaCl2 

22.  Calcium  Sulphate CaSO4 

23.  Calcium  Hydroxide CaCOH), 

24.  Magnesium  Sulphate MgSO4 

25.  Mercuric  Chloride HgCl2 

26.  Silver  Nitrate  (Amber) AgNO3 

27.  Lead  Acetate Pb(C2HA,)2 

28.  Ferrous  Sulphate FeSO4 

29.  Ferric  Chloride Fe.,Cl0 

30.  Alcohol C2HBOH 

31.  Ammonium  Sulphocyanide. NH4CNS 

32.  Barium  Hydroxide Ba(OH)_, 

33.  Barium  Carbonate BaCO3 

35.  Ether (C2H5),O 

36.  Cupric  Sulphate CuSO4 

38,  39,  40,  Blank. 

59.  Sodium  Carbonate Na2CO3 

61.  Sodium  Hydroxide .NaOH 


543a    1  set  of  above  40  bottles,  packed  in  shipping  order  Set,  Net    $6.00 


543b 


1  set  of  above  40  bottles,  filled  with  chemically  pure  reagents,  according  to 
Fresenius ;   bottles  included   Set,  Net 


12.50 


THE  DENVER  FIRE  CLAY  COMPANY. 


101 


No. 
543c 


Reagent  Bottles.     Same  style  as  No.  543;  capacity,  4  oz Doz.,  Net    $1.75 


No. 

37.  Platinic  Chloride PtCl4 

58.  Fehling's  Solution. 

59.  Sodium  Carbonate .Na2CO3 

60.  Sodium  Acetate NaC2H3O2 

61.  Sodium  Hydroxide NaOH 

77.  Ammonia NH3 

81.  Stannous  Chloride SnCl2 

82.  Ammonium  Molybdate (NH4)2MoO4 

83.  Carbon  Bisulphide CS2 

86.  Mercurous  Nitrate Hg2(NO3)2 

87.  Indigo  Solution. 

88.  Nessler's  Solution. 
90.  Magnesia  Mixture. 

93.  Oxalic  Acid H.,C2O4 

94.  Picric  Acid C6H2OH(NO2)3 

96.  Potassium  Chromate K3CrO4 


No. 

97.  Ammonium  Sulphydrate.  .NH4HS 
100.  Mercuric  Potassium  Iodide. 

401.  Barium  Nitrate Ba(NO3), 

404.  Silver  Sulphate Ag2SO4 

406.  Bromine  Water. 

407.  Chloroform CHC13 

408.  Cochineal. 

409.  Coralline. 

410.  Litmus. 

411.  Methyl  Orange. 

412.  Phenolphtalein. 

413.  Turmeric. 

414.  Iodine  Solution I  +  KI 

415.  Methyl  Alcohol CH3OH 

416.  Sodium  Cobaltic  Nitrite. 

417.  Sodium  Hyposulphite Na2S2O3 


544       Reagent  Bottles.     Capacity,  Vz  pt.  =  8  oz.  =  250  cc.  Height,  6%  in.  Doz.,  Net  $2.25 


No. 

101.  Sulphuric  Acid,  Con H2SO4 

102.  Sulphuric  Acid,  Dil H2SO4 

103.  Nitric  Acid,  Con HNO3 

104.  Nitric  Acid,  Dil HNO3 

105.  Hydrochloric  Acid,  Con..  .  ,HC1 

106.  Hydrochloric  Acid,  Dil..  . .  HC1 

107.  Hydrogen  Sulphide  (Amb.)H2S 

108.  Ammonium  Hydroxide NH4OH 

109.  Ammonium  Chloride NH4C1 

110.  Ammonium  Carbonate. . . .  (NH4)2CO3 

111.  Sodium  Hydroxide NaOH 


No. 

112.  Sodium  Carbonate Na2CO3 

114.  Barium  Chloride Bad, 

116.  Blank. 

122.  Ammonium  Sulphide (Amb.)  (NH4)2S 

129.  Sodium  Phosphate Na2HPO4 

130.  Ammonium  Oxalate (NH4)2C2O4 

131.  Acetic  Acid HC2H,O2 

145.  Silver  Nitrate  (Amber) . .  .AgNO3 

150.  Potassium  Hydroxide KOH 

151.  Calcium  Hydroxide Ca(OH), 

152.  Lead  Acetate Pb(C2H3O.,)s 


545       Reagent   Bottles.   Capacity,   1  pt.  =  500  cc.   Height,  7%   in    Doz.,  Net    $3.25 


No. 

204.  Ammonium  Hydroxide NH4OH 

211.  Blank. 

215.  Sulphuric  Acid H2SO4 

215a.  Sulphuric  Acid,  Dil H2SO4+Aq 


No. 

216.  Nitric  Acid HNO3 

216a.  Nitric  Acid,  Dil HNO3+Aq 

217.  Hydrochloric  Acid HC1 

217a.  Hydrochloric  Acid,  Dil. .  .  HCl+Aq 


546       Reagent  Bottles.    Capacity  1  qt.  =  1  litre.    Height,  9^  in Doz.,  Net     $4.00 


No. 

501.  Sulphuric  Acid,  Con H2SO4 

502.  Sulphuric  Acid,  Dil H2SO4 

503.  Nitric  Acid,  Con HNO3 

504.  Nitric  Acid,  Dil HNO3 


No. 

505.  Hydrochloric  Acid,  Con.. .  .HC1 

506.  Hydrochloric  Acid,  Dil.. . .  HC1 
511.  Blank. 


102 


THE  DENVER  FIRE  CLAY  COMPANY. 


550 


No. 

547       Reagent  Bottles.     Capacity,  1  oz.  =  30  cc.  Height,  3%  in Doz.,  Net     $1.25 


No. 

325.  Silver  Nitrate  (Amber) .  .  .  AgNO3 

326.  Cobaltous  Nitrate Co(NO3), 

327.  Platinic  Chloride PtCl4 


No. 

336.  Gold  Chloride AuCl., 

341.  Blank. 


548       Reagent  Bottles;   wide  mouth.     Capacity  1  oz.  =  30  cc.  Height,  3%  in. 

Doz.,  Net     $1.35 


No. 

350.  Sodium  Carbonate Na,CO3 

351.  Borax Na^O, 

353.  Sodium  Acetate NaC.,H3O., 

354.  Potassium  Nitrate KNO3 

358.  Potassium  Cyanide KCN 

361.  Am.  Sod.  Phosphate NaNH4HPO4 

364.  Copper Cu 

365.  Ferrous  Sulphate FeSO4 

366.  Ferrous  Sulphide FeS 


No. 

367.  Potassium  Chlorate KC1O3 

368.  Potassium  Ferricyanide. .  ,K3Fe(CN)6 

369.  Sodium  Bitartrate NaHC4H4O0 

370.  Sodium  Nitrate NaNO3 

371.  Starch. 

372.  Test  Paper. 

373.  Zinc. 

374.  Ammonium  Phosphate (NHJ.HPO, 

375.  Blank. 


549       Reagent  Bottles;  wide  mouth.     Capacity,  4  oz.=  125  cc.     Height,  4%  in. 

Doz.,  Net     $2.00 


No. 

301.  Sodium  Carbonate Na2CO3 

302.  Potassium  Nitrate KNO3 

303.  Potassium  Cyanide KCN 

304.  Borax 


No. 

305.  Ferrous  Sulphate FeSO4 

307.  Blank. 

312.  Test  Paper. 

313.  Sod.  Ammon.     Phosphate. 


550       Reagent  Bottle  Caps.     To  protect  stoppers  and  mouth  of  bottles  from  dust. 

Size  to  fit         4         8         16         32  oz.  Bottles. 
Doz.    "  $O80     .90     1.00      lT.20 

550a     Brooms.     Miners'  Whisks,  well  made    Each,  $0.30;    Doz.,     $3.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


103 


BRUSHES 


557 


559 


561 


552 

553 
554 
555 

556 

556a 
557 


558 
559 
560 

561 
562 


Brushes;    spun    glass.   For   acids 


Brushes;   camel  hair  pencils. 
Size          Small 


Medium 


Large 


Doz.  $0.15  20  .30 

Brushes;   camel  hair.     Extra  large  stock,  yz  in.  dia.,  quill  holder   . 
Brushes;  camel  hair.     Stock  1  in.  dia.,  quill  holder,  wooden  handle 


Each 


562 
$0.25 


.20 
.75 


Brushes;  camel  hair,  flat  tin  bound.    Wooden  handle;  for  scale  pans,  etc. 
Width         Ms         11%  2        2%       Sin. 


Each 


$0.15     .20       .30         .40       .50      .70 


Brushes;  camel  hair,  flat,  hard  rubber  bound.    Wooden  handle. 
Width  1        iy2         2        21/2         Sin. 


Each 


$0.50       .80       1.00     1.25      1.75 


Brushes;  bristle,  for  test  tubes.     Bristle  end,  on  tinned  iron  wire 

Each    .05     ....................................................  Doz. 

Brushes;  bristle,  for  test  tubes.  With  sponge  ends;  these  are  superior, 
inasmuch  as  the  brass  wire  holding  the  sponge  is  twisted  in  a  loop, 
thus  protecting  the  test  tubes  from  breakage. 

Size  for  %  in.  for  %  in.  1.  1. 


.30 


$O75  .B5~ 

Brushes;   bristle,  for  long  tubes,  burettes,  etc.     Three  feet  long  .....  Each 
Brushes;  bristle,  for  narrow  tubes.    Two  inches  length  of  bristle  .....  Doz. 

Brushes;  bristle,  for  cylinders,  large  tubes,  bottles,  etc.    Wire  handle. 
Length  10        12        15        20  in. 

Each~~         $O10        Tf5        20        [25 

Brushes;    bristle,  wood   handle.     For  beakers    ......................    Each 

Brushes;    bristle,  round  stiff.     For  brushing  out  platinum  crucibles,  etc   .  .  . 


.15- 
.15 


.20 
.10 


104 


THE  DENVER  FIRE  CLAY  COMPANY. 


570 


567 


No. 
563 


564 
565 

566 

566a 

567 

568 
569 

570 


IHIilllllHllKlllllil 

565  566  566a  568 

Brushes;  bristle,  flat,  hard  rubber  bound.    Wooden  handle. 

Width. 1        iy2        2        2V2         3  in. 

Each  $0.30          ^40 160 .80    1.00 

Brushes;   bristle,  for  assay  buttons,  Freiberg  pattern.     Genuine  bristle,  set 

in  firmly   Each    $0.50 

Brushes;  bristle,  for  buck  board  cleaning,  flat.    Well  set  in  block. 

Width 3        3V2        4        Sin. 

Each  $0.60         ^0      .80    1.00 

Brushes;    bristle,  for  buck  board  cleaning,   D.   F.  C.  Co.'s  Special,  flat,  tin 
bound.    Good  solid  stock,  firmly  set. 

Width 3        3y2        4        5  in. 

Each  $0.80        1.00    1.20    1.50 

Brushes;  bristle,  for  buck  board  cleaning,  flat,  rubber  set. 

Width 3        3%  '      4        Sin. 

Each  $1.00        1.25    1.50    2.00 

Brushes;    bristle,   for   buck    board    cleaning,   flat.     Rounded   handle;    extra 

quality  stiff  bristles;  width,  8  in.;  length  below  binding,  2%  in 1.20 

Brushes;   for  buck  board  cleaning    85 

Brushes;  bristle,  for  buck  board  cleaning,  softer  than  foregoing. 

No. 6789 

Length  of  brush  6  10  10  10  in. 
Length  of  bristle  2%  2%  3%  4  in. 
Each  $1.00  1.25  1.50  2.00 

Brushes;  wire,  for  scouring  bullion.    Double  end. 

Steel 50 

Brass  .50 


THE  DENVER  FIRE  CLAY  COMPANY. 


105 


BURETTES 


571 


572 


573 


574 


No. 
571 


572 


573 


574 


575 


Burettes;   Mohr's.  Most  accurately  graduated,  for  pinchcocks;  with  tip  and 
rubber  connection. 


Capacity 
Grad.  _ 
Each 


25 
1-10 


50 
1-10 


100 
1-5 


100  cc. 
1-10  cc. 


$0.65    1.20        1.50        2.00 


Burettes;   Mohr's,  with  side  filling  tube.    For  pinchcocks,  with  tip  and  rub- 
ber connection. 


Capacity 
Grad. 


25 
1-10 


50 
1-10 


100 
1-5 


100  cc. 
1-10  cc. 


Each  $0.75      1.25        1.75        2.20 

Burettes;    Mohr's,  with  Geissler's  glass  stopcock. 

Capacity          25         50         100        100  cc. 


Grad. 
Each 


1-10      1-10 


1-5       1-10  cc. 


$1.35      1.85 
Burettes;   Fresenius',  with  glass  stopcock. 
Capacity 


2.50 


Grad. 
Each 


25 
1-10 


50 
1-10 


100  cc. 
1-10  cc. 


$1.35      1.85        2.50 


Burettes;  Gawalowsky's,  with  glass  stopcock  and  glass  side  tube  with  stop- 
cock, for  filling  from  reservoir. 

Capacity          25        50        100  cc. 
Grad.  1-10      1-10       1-10  cc. 

Each  ~         $2^50      3XHJ         4^50 


106 


THE  DENVER  FIRE  CLAY  COMPANY. 


576a 


=13 


579 


Burettes;   Patent,  with  3  ways  glass  stopcock  and  tube  for  filling 
from  reservoir. 

Capacity  25         50         100  cc. 

Grad.  1-10      1-10        1-10  cc. 


Each 


$2.00     2.50         3.50 


576a 


Burettes;   Patent,  Automatic,  with  zero  point  and  overflow  reservoir. 
Capacity          25        50        iOO  cc. 


Grad. 


Each 


1-10     1-10       1-10  cc. 


$3.00      3.50        4.50 


577       Burettes;   Schellbach's.    With  dark  enameled  stripe  on  white  enamel  back- 
ground, giving  a  definite  meniscus;  with  tip  and  rubber  connection. 

Capacity  25         50         100  cc. 

Grad.  1-10      1-10        1-10  cc. 


Each 


$1.20      1.50        2.50 


578       Burettes;   Schellbach's,  with  glass  stopcock. 

Capacity          25        50        100  cc. 
Grad.  1-10      1-10        1-10  cc. 


Each 


$2.00      2.50        3.50 


579       Burettes;  Schellbach's,  with  patent  stopcock. 
Capacity          25        50        100  cc. 
Grad.  1-10      1-10       1-10  cc. 


Each 


$2.25      3.00        4.00 


580       Burettes;   D.  F.  C.  Co.'s.  With  absolutely  tight  stopcock,  bored  at  an  angle 
of  45  degrees. 

Capacity  25         50         100  cc. 

Grad.  1-10      1-10        1-10  cc. 


Each 


$150      2.00        3.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


107 


581 


582 


583a 


584 


595 


No. 

581 


582 


583 


583a 


584 

585 
586 
587 
588 
589 
590 
595 


Burettes; 


Burettes; 


Gay  Lussac's. 
Capacity 
Grad. 
Each 


On  polished  wooden  base. 

25         50         100  cc. 
1-10      1-10       1-5  cc. 
$i;00      1750        2.00 


Dispensing,  with  glass  stopcock.    For  liquids  in  larger  quantities. 
Capacity  250         500         1000  cc. 

Each 


$2.50        3.00 

Burettes;    Dispensing,  without  stopcock. 
Capacity          250        500 
Each  ~ 


4.00 

For  liquids  in  larger  quantities. 
1000  cc. 


$1.50        2.00 


3.00 


Burette    Titration    Apparatus.     Ground   joints,    with   automatic   zero   point. 
Burette,  complete  with  bottle,  rubber  bulb  and  clamp. 

Capacity,  25  cc.,  1-10   Net 

Capacity,  50  cc.,  1-10    Net 

Burette    Attachment.      For    connecting    the    burette    with    reservoir,    com- 
plete, as  per  sketch    

Burette  Caps.  To  protect  contents  of  burettes  from  dust,  assorted Doz. 

Burette    Float,    Erdmann's    Each 

Burette  Float,  Volhard's.    With  points  to  prevent  adhering  to  walls  . .  .Each 

Burette    Float,    Benedikt's    Each 

Burette    Float,    Beutell's    Each 

Burette  Tips    Each,   $0.05;    Doz. 

Buckets;   Amalgam  or  Quicksilver.     Of  iron,  inside  white  enamel. 

Capacity          2        3        4        6 8        12  qts. 

Each  $O40      .50      ^60      770      1&6 1TOO 


$5.00 
6.00 

.50 
,50 
.30 
.50 
.40 
.35 
.40 


108 


THE  DENVER  FIRE  CLAY  COMPANY. 


No. 

600 

601 
602 
603 
604 
604a 


BURNERS 


600 


602 


603 


604a 


Burner;   Argand.     Low  form,  7  in.  high,  giving  a  steady  and  large  flame, 

which  can  be  turned  down  very  low,  with  chimney   $1.10 

Burner;  Bunsen's.     Small  form,  nickeled;  2  in.  high,  tube  3-16-in.  dia 

Burner;  Bunsen's,  low  shape.     With  air  regulator    

Burner;  Bunsen's,     Usual  size,  with  air  regulator   

Burner;  Bunsen's.     Large  tube,   %-in.  diameter    


.50 
.50 
.35 
.50 
Burner;  Bunsen's  Improved.  With  flame  check  and  gas  regulator 1.00 


605a 


607 


608a 


605  Burner;    Bunsen's.     With  2  tubes,  and  air  regulators $1.25 

605a  Burner;    Bunsen's.     With  3  tubes,  and  air  regulators    1.50 

605b  Burner;   Bunsen's.     With  4  tubes,  and  air  regulators 2.00 

606  Burner;  Bunsen's.    With  4  burners,  in  one  row,  for  heating  long  tubes  . . .  4.50 

607  Burner;    Same  as  above,  with  stopcocks 6.00 

608  Burner;  Bunsen's  Self-adjusting,  for  burning  gases,  of  various  qualities   . . .  1.50 
608a  Burner;    Bunsen's,  for  gasoline  gas    .75 


THE  DENVER  FIRE  CLAY  COMPANY. 


109 


609 


609a 


610 


610a 


No. 

609  Burner;   Bunsen's,  with  fork  to  attach  to  ring  stand,  and  star  for  chimney    $1.50 
609a     Burner;   Bunsen's,  constant  flame,  with  stopcock  2.00 

610  Burner;    Chaddock's.     Of  porcelain,  incorrodible;   for  use  in  hoods  where 

metal  on  account  of  the  smoky  flame,  soon  corrodes.    Complete  with 

support  for  dishes,  chimney  and  three  asbestos  pads 2.00 

610a     Burner;    Detroit  style,  for  gasoline  gas    1.00 


611 


613 


612 


613a 


615 


611  Burner; 

612  Burner; 
612a  Burner; 

613  Burner; 
613a  Burner; 

614  Burner; 

615  Burner; 


Erlenmeyer's.     Giving  an  intensely  hot  flame $3.00 

Koch's  Safety.    On  adjustable  stand 10.00 

Koch's  Safety,  simple  form,  6  in.  high 6.00 

Teclu's,     Giving  a  large  and  powerful  flame,  %-in.  tube 

Illuminating.     Table   light,    12-in.   high    1.00 

Barthel's  Alcohol.    Absolutely  safe,  approximate  heat  1300°C   5.00 

Barthel's  benzine-boiler.     With  tube  for  Bunsen  flame 6.00 


110 


THE  DENVER  FIRE  CLAY  COMPANY. 


618a 


No. 
616 


617 


617a 
618 


618a 

619 

619a 


620 


621 


621a 


619 


620-1 


Burner,  Barthel's  Alcohol.     Bunsen's  style,  equal  to  4  Bunsen  gas  burners, 

complete  with  reservoir  and  5  ft.  flexible  metallic  tubing  ...........     $9.00 

Tripod   for   same    .................................................         .50 

Burner,  Barthel's  Benzine.     Working  without  wick;   equal  to  2  Bunsen  gas 
burners    ......................................................... 

Tripod  for  same 

Burner,  Turner's  Gasoline,  brass,  nickel-plated,  capacity  %  pint   .......... 

Burner,  Bunsen's  Adjustable.  Its  adjustability  renders  it  a  favorite  burner 
for  those  using  gasoline  gas,  or  the  mixture  of  gasoline  vapor  and 
air  made  by  gas  machines  ......................................... 

Burner,  same  as  No.  618,  with  adjustable  support  ........................       2.00 

Burner,  Tirrill's.    For  gasoline  gas;  very  highly  recommended  ............       1.20 

Burner,   Fletcher's    Evaporating    Burner. 

Size  4        5        6%-in.  dia. 


7.00 

50 

3.00 


1  .00 


Each  $1.00    1.25         2.00     Net 

Burner,  Fletcher's  Solid  Flame  Boiling  Burner. 
Size  Small      Large 


Each  $1.00      2.00  Net 

Burner,  Fletcher's  Solid  Flame.    For  gasoline  gas;  with  wheel  valve. 
Size  Small      Large 


Each  $1.75       3.00  Net 

Burner,  Fletcher's  Extra  Gauze  Tops,  for  No.  620-1. 
Size  Small      Large 


Each 


$0.30 


.35 


THE  DENVER  FIRE  CLAY  COMPANY. 


Ill 


No. 

622 


624 


625 


625a 


624-5 

Burner,   Fletcher's,  Argand  Style. 

Size  % 

Each  $0.65      1.00      1.25  Net 

Burner,  Fletcher's  Radial  Burner. 

Ring  Dia.         3%         5  in. 
$1.50 


625a        626 


in. 


Each 

Burner,  Fletcher's  Radial. 
Ring  Dia^ 
Each 

Burner,  Ring   Form. 
Size 
Each 
Burner  Attachment. 


2.00  Net 

For  gasoline  gas;  wheel  valve  regulator. 
3%         5  in. 
$2.25    S^OONeF 

345         6-in.  dia. 


$1.25     1.50     1.75     2.00 
To  set  into  the  Bunsen  burner,  "Burner  tube" 


632  632a 

627  Burner  Attachment.     To  set  over  the  burner;  with  rest  for  the  blow  pipe.  . .     $0.15 

628  Burner    Chimneys.      Of    Russian    iron    .20 

629  Burner  Crowns.     For  heating  dishes    .35 

630  Burner  Gauze  Top.     Giving  a  large  round  flame .25 

630a     Burner  Plates,  of  porcelain    60 

631  Burner  Tripods.  For  supporting  dishes    20 

632  Burner   Wingtop.  For  bending  glass  tubing    .15 

632a     Burner,  High  Temperature,  Without  Blast.    Designed  for  high  temperature 

fusions.     Very  efficient  and  in  many  cases  does  away  with  the  blast 

lamp  in  the  laboratory.     Price,  complete,  without  platinum  crucible. .       2.50 


112 


THE  DENVER  FIRE  CLAY  COMPANY. 


633 


633a 


633b 


No. 

633  Centrifuge,  Hand,  for  urine,  sputum,  milk  and  water  analysis,  gives  3,000 
revolutions  per  minute.  Complete  with  one  graduated  and  one  un- 

graduated   sedimentation  tube    Net  $10.00 

Graduated    sedimentation   tubes    Each        .35 

Ungraduated   sedimentation  tubes    Each        .15 

Graduated  Milk  tubes   Each        .50 

633a  Centrifuge,  Electric,  for  immediate  separation  and  precipitation  of  solids 
held  in  suspension  in  liquids.  For  use  in  the  testing  of  ores  and 
for  the  precipitation  of  lead  salts  in  manganese  determination.  The 
Electric  Centrifuge  is  arranged  to  run  on  either  the  direct  or  alterna- 
ting incandescent  circuit  of  104  to  115  volts,  but  can  be  arranged  for 
the  220-volt  direct  current  at  an  additional  cost  if  required.  It  is  a 
most  valuable  means  of  obtaining  immediate  sedimentation  of  solids, 
thus  effecting  a  great  saving  of  time  in  many  chemical  operations. 
The  liquid  containing  the  matter  to  be  precipitated  is  placed  in  the 
swinging  glass  tubes  which  are  protected  by  metal  shields,  the  ma- 
chine is  then  revolved  at  high  speed  and  the  solids  are  immediately 
precipitated  to  the  bottom  of  the  tubes.  Centrifuge,  as  shown  in 
cut,  with  two  glass  tubes  of  15  cc.  capacity,  protected  by  metal 

shields Net    32.00 

Extra  percentage  tubes    Each        .50 

Sediment    tubes     Each        .20 

This  Electric  Centrifuge  is  mounted  on  a  very  heavy  iron  base,  giving  it 
the  rigidity  absolutely  essential  for  accurate  work.  The  Centrifuges 
for  the  110-volt  direct  current  and  105-volt,  60-cycle  alternating  cur- 
rent are  arranged  with  controlling  lever  in  base  giving  medium  and 
high  speed. 

When  ordering,  specify  the  voltage  of  the  current  on  which  the  centrifuge 
is  to  be  operated  and  whether  the  current  is  "Direct,"  "Alternating 
60  Cycles"  or  "Alternating  125  to  133  Cycles." 

633b  Centrifuge,  Water  Motor,  for  the  rapid  and  convenient  sedimentation  of 
solids  in  urine  and  other  fluids.  Perfect  mechanical  construction. 
Absolutely  noiseless.  Contact  parts  cannot  become  rusted.  Needs 
no  attention.  May  be  left  running  constantly.  Anyone  can  operate 
it.  The  simplest  and  most  efficient  power  centrifuge  yet  offered. 

Price    Net    10.00 

Sedimentation  tubes,  plain  Each        .15 

Sedimentation  tubes,  graduated  Each        .35 

Milk  tubes,   graduated    Each        .50 


THE  DENVER  FIRE  CLAY  COMPANY. 


113 


C  C  C  C  C  C  C1  © 

c  c  c  c  c  o  c  c 


634 

No. 

€34  Button  Trays.  For  silver  buttons,  plates  5%x21/i  in.,  with  24  depressions 
of  %-in  dia.  and  %-in.  deep,  milled  smooth,  neatly  finished,  for  use 
inside  of  balance  case  .  $0.75 


634b 


Carboy  Inclinator,   Flaherty's,  for  convenient  drawing  of  liquids  from  car- 
boys     Bach 


6.00 


635a 


635       Casseroles; 


€35a     Casseroles; 


Royal   Berlin 

No.      

Dia. 

Capacity 

Each 


Porcelain.    With  porcelain  handle. 
1         2         3         3a         4         5         6 


2% 
3 


3%     3% 


4% 
13 


5% 
24 


6V2  in. 
44     oz. 


$0.35      .40      .50        .70      .85    1.40    1.75 
German    Porcelain.     With  porcelain  handle. 
Capacity          1        2        4        8        12        16        32  oz. 
Each 


$0.20      .25      .30      .35        .55        .80      1.00 


636 


637 


636 


637 


Casseroles;   German  Porcelain.     With  cover  and  wooden  handle. 
Dia.  344%         566%  in. 

Capacity          4        8       12          16       24      32     oz. 
Eiach  ~ 


Casseroles;    Agateware. 
Dia. 
Capacity 


$0.50      .60      .70          .90    1.25    1.60 

4%         5         6         7  in. 
Ipt.     24  oz.  lqt.%  gal. 


Each 


$0.25 


.30      .35      .45 


638       Chamois  Skins.    Best  quality,  entirely  waterproof;  size  16x18  in Each    $0.75 

.50 


640       Charcoal,  of  hard  wood,  cut  in  oblong  pieces  4%  xl  in.;  for  blow  pipe  use 

Dozen 


114 


THE  DENVER  FIRE  CLAY  COMPANY. 


640a 


No. 

640a 


Calorimeter.     Parr's  Standard  Calorimeter, 
of  the  University  of  Illinois. 


Devised  by  Prof.  S.  W.  Parr, 


The  marked  features  of  the  method  are  accuracy,  simplicity,  ease  and  rap- 
idity of  manipulation.  The  results  are  absolute,  not  relative.  The 
operations  are  such  as  can  be  carried  on  by  one  not  especially  skilled 
in  laboratory  processes.  Oxygen  under  pressure  or  otherwise  is  not 
used. 

The  instrument,  as  priced,  includes  the  Calorimeter  proper,  a  guaranteed 
accurate  thermometer  graduated  to  1-20°F.;  a  2000  cc.  graduated 
flask  measuring  cup,  5-inch  brass  sieve  100  mesh,  pincers,  reading 
lenses,  camel's  hair  brush,  igniting  wire  and  chemicals  for  fifty  de- 
terminations. 

Price  complete,  for  wire   ignition    $70.00 

Price,  complete,  for  electrical  ignition,  including  battery   75.00 

Price  of  water  motor,  for  stirring   5.QO 

Descriptive  circular  on  application. 

Any  other  make  of  Calorimeter  quoted  on  application.     Hempel,  Junker, 
Mahler,   Thompson,   Emerson,   etc. 


THE  DENVER  FIRE  CLAY  COMPANY. 


115 


CLAMPS 


641 


642-642a 


643-645 


646 


1' ' ""i1 '""f 

F  'r?'T"-!^LVl:llll'llllllllliiiiml 


647 


647a 


648 


649 


No. 

641 

642 

642a 

643 

644 

€45 
646 


647 

647a 
648 

649 


Clamps,  wood,  for  test  tubes.     With  rubber  band  Each. 

Clamps,  Stoddard's.    Of  spring  wire;  for  test  tubes,  4^  in.  long 

Clamps,  Stoddard's.     For  large  test  tubes,  6%  in.  long 

Clamps,  Chaddock's,  for  test  tubes.     Of  japanned  spring  wire,  rubber  cov- 
ered jaws    

Clamps,   Chaddock's,   for   beakers.     Of  japanned   spring  wire,  rubber  cov- 
ered jaws    

Clamps,  Chaddock's,  for  evaporating  dishes.  Of  japanned  spring  wire  

Clamps,  Mohr's,  s.  c.  Pinchcocks.    Nickel-plated;  strong  spring. 

Size  Small        Medium        Large 

EacTT~  $0.10  /|2  il5~ 

Clamps,  Hofmann's  Screw  Compressor.    Nickel-plated. 

Size  Small        Large 

EaclT~  $0.20        ~25~ 

Clamps,  Hofmann's  Screw  Compressor.    Nickel-plated,  improved  form;  can 

be  used  on  tubing  without  disconnecting  the  apparatus   Each 

Clamps,  Hofmann's,  latest  form.    Nickel-plated;  for  rubber  tubing  up  to  1  in. 

Width  %         1%  in. 

Each            $0.20          i30 
Clamps,  Bunsen's,  for  rubber  tubing.     Of  brass;  iy2  in.  wide  


$0.15 
.10 
.15 

.25 

.25 
.25 


.25 


.30 


650a 


650  Clamps,  Bunsen's,  for  heavy  rubber  tubing.  Can  be  screwed  on  table;  to 

hold  tubing  up  to  2  in $0.75 

650a  Clamps,  Brass;  triangle  with  adjustable  screws,  to  support  different  sizes 

of  crucibles  1.20 


116 


THE  DENVER  FIRE  CLAY  COMPANY. 


652 


655a-656 


No. 

G51 
652 
653 

654 
655 
655a 

656 
657 


658 


659 
660 


Clamps,  for  burettes,  etc.,  with  set  screws,  iron.    To  attach  to  a  retort  stand 

Clamps,  for  burettes.     With  strong  spring  closing  the  movable  jaw   

Clamps,  Hofmann's  Improved,  for  two  burettes  or  tubes.    Elegantly  finished, 

of   malleable   iron    

Clamps,  Bunsen's,  for  holding  burettes,  etc.  With  fastener  complete  . . . 
Clamps,  Bunsen's,  for  large  tubes  and  condensers.  With  fastener  complete 
Clamps,  Bunsen's  Universal,  for  condensers,  etc.,  the  jaws  adapting  them 

selves  to  irregular  shapes ;  with  fastener  complete 

Clamp,   Bunsen's   Universal,  for  very   large   apparatus,  the   jaws   adapting 

themselves  to  irregular  shapes ;  with  fastener  complete 

Clamps,  iron.    For  fastening  apparatus  to  table. 

Size  opening    2         3         4         5         6  in. 


$0.40 
.50 

.75 
.75 
.75 

.80 

1.25 


Bach          $0.20      .25      .35      .50      .60 
Clamp  Holders.    For  fastening  clamps  to  supports. 
Size  Small        Large 


(See  Fig.  655.) 


Each  $0.20  .25 

Clamp  Holders,  Universal.     To  set  at  any  angle 
Clay  Tubes.    Of  fire  clay;  length  24  in. 

Bore  1-16         %  in. 


Price  $0.60         .60 

Note: — We  will  furnish  estimates  on  any  other  size  of  clay  tubes. 


.50 


THE  DENVER  FIRE  CLAY  COMPANY. 


117 


COMBUSTION  FURNACES,  ETC. 


661 


663 


No. 

661       Color  Test  Plates,  porcelain.     With  12  cavities;  size,  31A  x  41/4  in $0.50 

With  12  cavities ;  size,  5  x  6%  in 60 

661a  Color   Test    Plates,    porcelain.     With  30  cavities;  size,  5%  x  7  in 1.50 

With  24  cavities ;  size,  4  %  x  7  in 1 .25 


662 
663 

664 


Color  Test  Plates,  porcelain.     Without  cavities ;   5V£x7in 1.20 

Combustion  Boats,  Royal  Berlin  Porcelain. 

Size          45x12  mm.     55x12  mm.     75  x  12  mm.     100  x  12  mm.     100x20  mm. 
Each 


$0.20 


.20 


.25 


.30 


.35 


Combustion  Furnace,  Glaser's.  Modified  by  Anschuetz  &  Kekule;  with  21 
burners  and  mica  plates  for  watching  the  combustion;  a  first-class 
furnace  50.00 


665 


665       Combustion  Furnace,  Bunsen's.     Each  burner  having  separate  stopcock. 
Length  14         19         25         31  in. 

Width  10         15         20         25  burners. 

Each  $18.00    24.00  ToTOO    36.00 


118  THE  DENVER  FIRE  CLAY  COMPANY. 


"ELECTRIC" 
COMBUSTION  FURNACE 


No. 

665a     Combustion    Furnace   "Electric."     Electric   Combustion   Furnace  for   rapid 

determination  of  carbon  content  of  steels  by  the  direct  method.  A 
complete  combustion  in  25  minutes.  The  tube  is  one  (1")  inch 
inside  diameter  and  twelve  (12")  inches  long;  ten  (10")  inches  of 
this  length  is  uniformly  heated  to  a  constant  temperature  of  1000 °C. 
In  order  to  get  this  temperature  be  sure  to  let  us  know  the  exact 
voltage  at  the  place  where  the  furnace  is  to  be  used,  otherwise  we 
cannot  guarantee  results.  Operates  equally  well  on  Direct  or  Al- 
ternating circuits  and  is  made  for  110  or  220  volts;  other  voltages 
to  order.  Requires  6  amperes  at  110  volts,  and  3  amperes  at  220 
volts.  Price  $40.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


119 


666 
No. 

666       Combustion   Tubes,   infusible   glass.     With  drawn  out  point,  bore   13   mm. 
Any  other  diameter  or  length  made  to  order. 


Length 
Each 


14 


16        18 


20 


24  in. 


$0.20 


.25        .30        .35 


.40 


667-668 


667 


668 


668a 


Combustion  Tubes,  German  porcelain. 
Length  18        20 

Each 


Bore,   %-in.  diameter. 
22 24  in. 

~$TOO      1^20 l735      1 .75 

Combustion  Tubes,  Royal  Berlin  porcelain.    Glazed  inside  and  outside,  24  in. 
long. 

Bore  %         %        1%         1%         1%  in. 

Each 


$4.00      5.00        6.00        7.00 


8.00 


Combustion  Tubes,  Electroquartz.     Not  transparent. 

On  all  of  these  the  edges  are  fused  smooth. 

Inner 
Length.  Diameter. 

18-inch   %-inch 

18-inch   %-inch 

24-inch %-inch 

24-inch  %-inch 

24-inch  %-inch 

30-inch  %-inch 

30-inch   %-inch 


Price 

each. 

$2.75 

3.25 

3.50 

4.50 

5.00 

5.50 

6.00 


669 


670a 


670 


669  Compass,  Pocket.    Brass  case,  with  cover,  metal  dial,  stop  to  needle,  1%-in. 

diameter    $1.00 

670  Compass,  Pocket.    Watch  pattern,  nickel-plated,  hunting  case,  agate  center, 

improved  stop,  1%-in.  diameter  2.00 

670a     Compass,  Miners'  or  Dipping  Needle,  3  inches  in  velvet  lined  case 12.00 


120 


THE  DENVER  FIRE  CLAY  COMPANY. 


CONDENSERS 


Y    -t 


671 


675-6 


No. 
671 


672 


673 


674 


675 


676 
677 


674 


Condensers,  Liebig's,  glass.    With  rubber  connections. 
Body  12         15         18         20         24 


30 


40  in. 


Each 


$1.00      1.10      1.20      1.35      1.50      2.00      3.00 


Condensers,  Liebig's.     The  condensing  tube  sealed  in  the  glass  body. 
Body  10         12         15         20  in. 


Each  $0.85     1.00       1.20       1.40 

10         12         16  in. 


Condensers,  Allihn's,  all  glass. 
Body  8 


Each 


$1.00      1.20      1.40      1.60 


Condensers,  Liebig's,  brass.     Inside  tube  of  glass. 
Length  12         15         20         30 


40  in. 


Each 


$2.50      3.00      3.50      4.50      6.00 


Condensers,    Soxhlet's,  ball  shape,  all  glass. 
Dia.  4         5  in. 


Each             $3.50     5.00 
Condensers,  Soxhlet's,  ball  shape,  of  metal,  nickel-plated;  dia.  4  in $3.00 

Condensers,  Hal  lock's,  of  copper,  with  pure  block  tin  condensing  coil,  has 

two  rods  for  support;  size,  14%  x  4  in 6.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


121 


CORKS 


No. 

681       Corks,  tapering,  regular  length,  XX  quality. 
No.  1234 

Dia.  small  end  %    5-16       %    7-16 
Gross 


6 
9-16 


7      8 

%  11-16  in. 


$0.20      .20      .25      .30      .35      .40      .50      .60 


No.  9      10       11      12 

Dia.  small  end  %     %    13-16    % 


14      16      18      20      22      24      26 
1     1%    1%    1%    1%    1%    l%in. 


Gross  $0.75  .90     1.00  1.20  1.40  1.80  2.20  2.60  3.40  4.00  4.30 

682       Corks,  flat,  for  wide  mouth  bottles,  superior  XX  quality. 

Dia.  large  end  1        1%         1%         1%         1%        1%        1%  in. 


Gross             $0.80 
Dia.  large  end  1% 

1.00 
2 

1.40 

m 

1.60 
2% 

1.80 

2% 

2.00 
3 

2.40 
3^  in. 

Gross 
Doz. 

$3.00 
.30 

3.50 
.35 

4.50 
.40 

6.00 
.60 

8.00 
.80 

11.00 
1.00 

14.00 

1.25 

G83-683a. 


683 


683a 
684 
684a 
685 


686 


12        15  pieces 


Cork  Borers;  hard  brass,  well  finished. 

Sets  of  369 

Each  $0.60    1.00    1.75      2.25      3.00 

Cork  Borers,  of  hard  drawn  steel,  nickel-plated,  set  of  6  pieces $3.00 

Cork    Borer    Sharpener Each       1.00 

Cork    Knives Each         .20 

Cork  Plates,  size  4  x  12  in.,  XX  quality. 

Thickness        1-16         %         3-16         %         %  in. 

Each                 $0.15       .25           .35        .50        .70 
Cork  Press,  lever  model  . .  Each        .35 


687 

687  Cork  Press,  rotary,  for  small  and  large  corks Each    $1.00 

688  Corkscrews,   good   quality    Each        .25 


122  THE  DENVER  FIRE  CLAY  COMPANY. 

Black  Lead  Crucibles  and  Their  Use 

Many  users  of  black  lead  crucibles  do  not  fully  appreciate  the  importance  of 
keeping  and  handling  their  crucibles  in  a  manner  that  will  insure  the  greatest  number 
of  heats.  Notwithstanding  the  fact  that  graphite  will  withstand  a  temperature  almost 
beyond  the  limit  of  calculation,  and,  when  made  into  a  crucible,  has  the  appearance 
of  being  anything  but  fragile,  it  is  in  the  respect  of  usefulness  a  very  delicate  article, 
and  many  perfect  crucibles  are  ruined  through  the  neglect  of  the  user,  and  the  crucible 
gets  the  blame.  Accidents  with  crucibles  are  both  annoying  and  expensive,  and  in 
nearly  all  cases  can  be  avoided  by  proper  annealing. 

The  most  common  complaint  which  the  dealer  has  to  contend  with  is  what  is 
called  scalping,  and  is  invariably  caused  by  carelessness  in  annealing.  When  the  cru- 
cible comes  from  the  kiln  it  contains  less  than  one-fourth  of  one  per  cent,  combined  mois- 
ture. In  this  condition  it  is  absolutely  impossible  to  scalp  it.  But  the  minute  it  cools 
off,  it  begins  to  absorb  moisture,  and  the  amount  depends  upon  the  condition  in  which  it 
is  kept.  Crucibles  should  be  stored  in  as  dry  a  place  as  possible. 

Our  crucibles  are  especially  prepared  with  an  outside  coating  which  excludes  the 
greater  part  of  the  moisture.  This  coating  burns  off  when  the  crucible  is  annealed  and 
in  no  way  affects  it,  except  from  helping  to  keep  out  the  moisture  as  above  stated.  The 
coating,  however,  does  not  keep  out  all  the  moisture,  and  it  is  necessary  to  anneal  the 
crucible  by  heating  it  very  gradually  to  a  temperature  of  about  two  hundred  and  fifty 
degrees  (250°)  Fahrenheit  to  thoroughly  dry  it  out.  For  instance  with  a  No.  200  or 
No.  300  crucible,  it  should  take  at  least  ten  hours  to  bring  the  crucible  up  to  this  tem- 
perature, if  the  crucible  is  cold  to  start  with.  If  heated  quickly,  the  moisture  cannot 
escape  fast  enough  and  becomes  steam,  expands,  and  if  it  does  not  explode  or  scalp  the 
crucible,  it  is  liable  to  cause  small  cracks  or  fissures  which  will  not  show  on  the  sur- 
face, but  may,  after  the  crucible  has  been  used  a  few  times,  develop  into  what  are  called 
pin  holes  from  which  the  molten  metal  will  leak. 

In  some  instances  a  crucible  (without  the  special  coating),  that  has  been  stored 
in  a  damp  place,  might  develop  pin  holes  even  with  the  most  careful  annealing. 

Every  means  should  be  used  that  will  aid  in  keeping  a  crucible  from  absorbing 
moisture.  For  this  reason  our  specially  prepared  crucibles  reach  the  consumer  in  much 
better  condition  than  the  crucibles  usually  supplied  by  other  dealers.  Another  thing 
which  is  most  important,  is  when  the  annealing  process  has  been  properly  completed, 
the  crucible  should  be  charged  and  put  into  the  furnace  at  a  temperature  of  about 
two  hundred  and  fifty  degrees  (250°)  Fahrenheit,  or  without  allowing  it  to  cool  off  any 
more  than  can  be  helped,  until  a  heat  has  been  taken  off. 

If  the  crucible  after  having  been  annealed  is  placed  on  a  damp  floor  or  ground  and 
allowed  to  cool,  the  annealing  counts  for  nothing.  It  is  a  mistake  to  think  that  after  the 
crucible  has  been  annealed  it  is  impervious  to  moisture,  for  it  is  not,  and  if  allowed  to 
cool,  will  take  up  moisture  just  as  readily  as  before. 

Concerning  the  proper  method  of  annealing,  there  can  be  no  fixed  rules,  as  con- 
ditions differ.  Some  of  the  largest  users  are  equipped  with  special  furnaces  for  this 
purpose,  but  the  most  general  method  is  to  anneal  on  the  top  of  the  furnace,  which 
slowly  drives  out  the  greater  part  of  the  moisture.  In  any  event,  care  should  be  taken 
that  gases  from  the  fuel  do  not  strike  the  crucible  while  annealing.  Fresh  fuel  or  im- 
proper combustion  produce  more  or  less  gas  which  moistens  the  sides  of  the  crucible,  an 
oxidizing  condition  develops,  and  when  the  temperature  is  sufficiently  high,  causes  small 
cracks  on  the  outside  of  the  crucible,  usually  termed  as  alligator  cracks.  This  sometimes 
occurs  when  crucibles  placed  on  the  top  of  the  furnace  to  dry,  are  too  near  the  opening, 
which  may  for  some  reason  not  be  closely  covered. 

Fortunately,  these  troubles  are  not  general  and  are  as  a  rule  confined  to  the 
small  users.  Large  consumers  of  crucibles  have  educated  themselves  along  these  lines, 
and  have  annealing  ovens  or  other  proper  methods  for  annealing,  with  the  result  that 
crucible  troubles  are  eliminated. 

Another  thing  which  often  shortens  the  life  of  a  black  lead  crucible  is  the  im- 
proper fit  and  bad  management  of  tongs.  The  gripping  portion  of  the  tongs  should  fit 
the  crucible  so  that  when  clamped  to  it  the  pressure  is  equally  distributed.  Tongs  that 
fit  badly  or  are  handled  carelessly  gouge  pieces  out  of  the  side  and  press  the  crucible 
out  of  shape,  as  a  hot  crucible  is  more  or  less  plastic.  Some  damage  of  this  nature  is 
to  be  expected  and  only  natural,  because  tongs  for  large  crucibles  are  cumbersome  and 
the  work  of  operating  them  uncomfortable  on  account  of  the  heat. 

The  new  tilting  furnaces  obviate  this  latter  difficulty  as  no  tongs  are  required. 
The  crucible  remains  stationary  in  the  furnace  which  is  another  saving  feature  on  ac- 
count of  the  fact  that  it  is  not  subject  to  sudden  changes  of  temperature  as  is  the  case 
with  the  old  style  of  Pit  furnace  where  the  crucible  must  be  lifted  out  to  pour. 

See  Steele-Harvey  Tilting  Furnaces. 


THE  DENVER  FIRE  CLAY  COMPANY. 


123 


CRUCIBLES  AND  RETORTS 

Agents  for  Joseph  Dixon  Crucible  Co. 


THE  WORLD  FAMOUS  GRAPHITE  CRUCIBLE. 


THE  HIGHEST  AVERAGE  RESULTS  are  obtained  by  the  use  of  DIXON'S  CRU- 
CIBLES. 

For  use  in  melting  Cyanide  Precipitates,  Gold,  Silver  and  precious  metals,  and  are 
used  by  the  various  mints  of  the  world. 

They  are  adapted  for  use  in  the  making  of  Low  and  High  Steam  Brass,  Phosphorus, 
and  Manganese  Bronze,  Copper  Castings,  Aluminum  Mixtures,  Crucible  Steel,  etc. 


124 


THE  DENVER  FIRE  CLAY  COMPANY. 


CRUCIBLES 


No. 

701       Crucibles,  Black  Lead  or  Plumbago,  Dixon's. 


Nos. 

Holding 
Capacity 
Liquid 
Measure. 

Height 
Outside. 

Diam.  at 
the  Top 
Outside. 

Diam.  at 
the  Bilge 
Outside. 

0.  .  . 

.    7-32  pt. 

.    2    in.  . 
.    2|in.  . 
.    21  in.. 
.3    in.. 
.    3£in.  . 
.    41  in.. 
.    5}  in.  . 
.    5f  in.  . 
.6    in.. 
.   61  in.  . 
.   6|in.  . 
.    7}  in.. 
.    7fin.. 
.8    in.. 
.8    in.. 
.   81  in.  . 
.    8|  in. 
.   9fin. 
.  .  10}  in.  . 
.10}  in. 
.11}  in., 
.llf  in.. 
.  12f  in.  . 
.13    in.. 
.  13f  in.  . 
.14    in.. 
.  14£  in.  . 
.  15J  in.  . 
.15|  in.  . 
.16iin.. 
.  161  in.  . 
.  181  in.  . 
.  20}  in.  . 
.22    in.. 

.    11  in.. 
.    l|in.. 
.    If  in.. 
.    2f  in.. 
.    3}  in.  . 
.    3|in.  . 
.   4}  in.  . 
.    4f  in.  . 
.    4|in.. 
.    5}  in.. 
.    51  in.  . 
.    5|in.. 
.    51  in.. 
.    6    in.. 
.   6}  in.  . 
.    6f  in.  . 
.    7    in.  . 
.   71  in.. 
.    7$  in.. 
.8    in.. 
.    8fin.  . 
.    9}  in.  . 
.    9}  in.  . 
.    9|in.. 
.  10i  in.  . 
.  101  in.  . 
.10|  in.. 
.11}  in., 
.llf  in.. 
.11|  in.. 
.  121  in.  . 
.13    in.. 
.  14|  in.  - 
.  16}  in.  . 

.    If  in.  .  .  EJ 
.    l|in... 
.    2$  in... 
.    21  in.  .  . 
.    3    in.  .  . 
.    3f  in.  .  . 
.    4iin... 
.    41  in.  .  . 
.    4|  in.  .  . 
.    5|  in.  .  . 
.   51  in.  .  . 
.    5|  in.  .  . 
.   6}  in.  .  . 
.    61  in.  .  . 
.    6|in..., 
.    7fin... 
.    71  in.  .  .  I 
.   8    in.  .  .  f 
.    8fin...J 
.   8iin..-1 
.   9}  in.  .  . 
.    9|  in.  .  . 
.  10}  in.  .  . 
.  101  in.  .  . 
.lit  in.  .  • 
.llf  in... 
.12    in...  > 
.12f  in.  .  . 
.  121  in.  .  - 
131  in.  .  . 
.13|  in.  .  . 
.  14f  in.  .  . 
.  161  in.  .  . 
.  171  in.  .  .  „ 

ich            $0.25 
.25 
.25 
.25 
.30 
.35 
.40 
.45 
.50 
.60 
.70 
.75 
.80 
.85 

Nos.  12-20  inclusive 
71  cts.  per  No. 

No.  25  and  upward 
7  cts.  per  No. 

00.  .. 

1-16  pt. 

000  ... 

*  Pt.  . 

0000  .  .  . 

}  Pt.  . 

1.  .  . 

i  pt. 

2.    . 

I  pt 

3 

1     pt 

4.  .  . 

11  pt. 

5.  .  . 

U  pt. 

6.  .  . 

1 

qt 

pt.  . 

7.  .  . 

1 

at 

}  pt.  . 

8.  .  . 

1 

qt.  . 

1  Pt. 

9.  .  . 

1 

at 

I  pt 

10.  .  . 

1 

qt 

1    pt.  . 

12.  .. 

2 

nt 

pt.  . 

14.  .  . 

2 

qt.. 

at 

.  .    1   pt.  . 
1    pt 

16.  .  . 

2 

18.  .. 

3 

at 

1    pt.  . 

20.  .. 
25.  .. 
30.  .. 
35.  .. 
40.  .. 
45.  .  . 
50.  .. 
60.  .. 
70.  .  . 
80.  .. 
90.  .. 
100.  .. 
125.  .  . 
150.  .. 
200  ... 
300.  .. 

.    Igal... 
.    1  gal.  .  . 
.    1  gal.  .  . 
.    Igal... 
.   2  gal.  .  . 
.   2  gal... 
.   2  gal... 
.   3  gal.  .  . 
.    3  gal  .  . 
.   3  gal.  .  . 
.    4  gal.  .  . 
.   4  gal.  .  . 
.   4  gal.  .  . 
.   6  gal.  .  . 
.   9  gal.  .  . 
.  12  gal.  .  . 

.    1 
.  .    2 

'    1 
.  .    3 

.  .    1 

.  .    2 

!  '    2 
.  .    3 
.  .    3 
.  .    3 
.  .    2 

qt.. 
qt.. 
qt.. 
qt.. 
qt.. 
qt.. 
qt.. 
qt  . 
qt.. 
qt.. 
qt.. 
qt.. 
qt.. 
qt.. 
qt.. 
qt.. 

pt.. 

.  .    1   pt.  . 
.  .    1   pt.  . 
.    1   pt.  . 

pt.. 
pt.. 
pt.  . 
pt.. 
pt.. 

.    1   pt.  . 

pt.. 

.    1  pt.  . 
.    1  pt.  . 

pt.. 

.     1  pt.. 

pt.. 

702 


703 


704 


Crucible  Covers,  Black  Lead. 

No.  123 


10         12 


Bach      $0.20     .20      .20      .20      .20      .25      .25      .25       .30        .35 

All  sizes  of  covers  above  No.  12  per  No.  at  2%  cts. 

Crucible  Stirrers,  Black  Lead.     Length  14%  in Each     $0.60 

Crucible  Stirrers,  Black  Lead.    Length  9  in.,  Mint  size "  .40 

Crucible  Stirrers,  Fire  Clay.    Length  16  in "  .20 


STEELE-HARVEY  CRUCIBLES  AND  RETORTS  Quoted  upon  Application 


THE  DENVER  FIRE  CLAY  COMPANY. 


125 


CLAY  CRUCIBLES 


705 


OUR  OWN   MANUFACTURE. 


In  considering  the  selection  of  a  crucible  the  relative  difference  in,  first  cost  of 
ours,  and  of  the  inferior  grades,  is  of  small  moment  to  the  loss  frequently  occasioned  to 
more  expensive  equipment  by  the  use  of  the  cheaper  article.  A  crucible  running 
through  onto  the  muffle  bottom,  which  frequently  occurs  on  the  first  fusion  of  the 
many  cheap  grades  on  the  market  results  in  loss  of  muffle  efficiency,  which  is  many 
times  more  valuable  than  the  crucible  itself,  and  also  of  flux,  time  and  labor. 

It  is  always  a  matter  of  regret  to  the  manufacturer  that  the  consumer  is  not 
as  fully  prepared  to  exercise  the  same  care  of  his  goods  as  he  is  himself.  All  appre- 
ciate the  impossibility  of  this,  as,  knowing  the  details  of  construction  which  he  is  many 
times  compelled  to  withhold,  he  is  naturally  sensitive  to  the  importance  of  following 
certain  rules  to  obtain  the  maximum  efficiency  from  his  products,  of  which  the  con- 
sumer cannot  be  aware. 

With  these  facts  strongly  in  mind  we  cannot  but  feel  it  will  be  of  interest  to  the 
many  users  of  our  clay  goods  if  we  give  here  such  few  suggestions  as  our  space  will 
permit,  to  the  end  that  they  receive  a  better  return  on  the  money  they  have  invested 
and  at  the  same  time  frequently  relieve  us  of  unjust  criticism  due  to  the  lack  of  that 
intimate  knowledge  of  our  products  which  if  appreciated  would  prevent  the  violation 
of,  sometimes,  the  simplest  of  rules. 

We  recall  to  mind  an  illustration  of  this  which  happened  only  recently  where 
one  of  the  most  prominent  Western  Assayers  sent  us  a  sample  of  a  crucible  with  which 
he  found  serious  fault,  it  showing  a  straight  crack  from  top  to  bottom,  through  which 
the  slag  had  run  and,  to  quote  from  his  letter,  "was  in  the  fire  but  20  minutes."  Know- 
ing of  the  strain  which  comes  on  a  crucible  exactly  where  this  crack  appeared,  in  pack- 
ing and  transporting,  it  was  at  once  apparent  the  crucible  was  cracked  before  being 
put  into  the  muffle,  though  of  course  not  visible  to  the  eye.  If  the  operator  had  taken 
the  simple  precaution  to  tap  the  crucible  with  a  pencil  before  weighing  in  the  charge  he 


126  THE  DENVER  FIRE  CLAY  COMPANY. 


would  have  noticed  the  absence  of  the  bell-like  ring  given  by  the  perfect  crucible,  and 
discarded  it,  completing  the  assay  in  another  crucible  without  annoyance,  sparing  us 
the  criticism  we  in  no  sense  deserved,  as  a  good  crucible  is  necessarily  fragile  and  will 
sometimes  break  in  spite  of  the  precautions  we  take  to  guard  against  it. 

The  most  frequent  cause  of  poor  service  is  the  presence  of  moisture.  Crucibles 
are  particularly  subject  to  absorption,  and  by  actual  experiment  in  our  laboratory  we 
have  found  from  20  per  cent,  to  40  per  cent,  is  added  to  the  life  of  crucibles  by  having 
them  perfectly  annealed  over  those  kept  in  a  damp,  or  even  cold,  place  immediately  prior 
to  their  use. 

Invariably  the  assayer  studies  the  ores  of  his  district  with  a  view  to  the  selec- 
tion of  a  flux  that  makes  a  perfectly  fluid  slag.  Many  fail  to  consider,  however,  that 
there  may  be  present  some  ingredient  that  attacks  the  crucible  as  readily  as  it  does  the 
ore,  greatly  decreasing  its  life  when  some  simple  change  in  the  mixture  will  answer 
equally  as  well  on  the  ore  and  have  little  or  no  effect  on  the  crucible. 

We  have  been  manufacturing  35  years,  and  during  that  time  have  constantly 
aimed  to  perfect  our  clay  goods  to  the  smallest  detail.  That  we  have  in  a  measure 
succeeded  is  attested  by  the  awarding  to  us  of  gold  medals  over  all  competitors  at  all 
of  the  great  Expositions,  and  the  constantly  increasing  demand  from  the  trade. 

As  it  is  naturally  impossible  for  us  to  make  crucibles  for  the  different  conditions 
present  in  the  many  localities  in  which  they  are  used,  we  suggest,  if  you  have  any  diffi- 
culties in  getting  the  service  from  them  that  you  may  reasonably  expect,  you  at  once 
advise  us  and  let  us  make  an  investigation  of  your  conditions,  before  you  condemn. 

We  know  they  are  the  best  grade  of  Metallurgical  clay  goods  manufactured  in 
the  world,  and  if  you  are  not  getting  the  service  it  is  due  to  some  local  condition  which 
we  will  take  pleasure  in  assisting  you  to  correct.  In  a  recent  International  competition 
test,  our  crucibles,  in  barrel  lots,  stood  an  average  of  twenty-seven  fusions  per  crucible. 
Our  nearest  competitor,  a  foreign  manufacturer,  stood  an  average  of  seventeen.  Other 
domestic  makes  showed  a  considerably  less  number. 

We  have  full  data  of  the  experiments,  formulae,  and  methods  of  the  past  35  years, 
and  thorough  knowledge,  derived  by  long  experience,  so  necessary  in  the  manufacture 
of  good  crucibles. 

Examine  your  goods.  None  genuine  unless  stamped,  "Denver  F.  C.  Co."  They 
have  many  imitators,  but  no  equals.  Specify  Denver  Fire  Clay  Co.  and  get  products  of  a 
house  with  a  record  who  stand  back  of  their  goods. 

705  Crucibles,  Clay,  our  own  manufacture. 

These  crucibles  are  made  in  both  hard  and  soft  burn. 

Capacity          5        10        12        15        20        30  35        40  grm. 
Height              2%       3           3%       3V2       3%       3%       4%  5%  in. 
Dia.  at  top       2%       2%       2%      2%       3          3V2       3*4  3%  in. 

Per  100  $2.50      3.00     3.00      3.00      4.00      6.00  6XJO     {T00~ 

706  Covers  for  above.  Per  100  $2.25      2.25      2.25      2.25      3.50     4.00      4.00      5.00 

707  Crucibles,  Clay,  our  own  manufacture,  tall,  narrow  form;  superior  for  gas  or 

gasoline  furnaces. 

No  6orD  8         9 

Height                  4  5        5%  in. 

Dia.  at  top            2%  2%     3     in. 

Per  100  $3^50  7.00   8.00 

708  Covers  for  above.  Per  100        2.25         2.25    3.50 


THE  DENVER  FIRE  CLAY  COMPANY. 


.127 


709       Crucibles,  Clay,  high  form,  our  own  manufacture,  for  gasoline  or  open  fur- 
nace work. 


No. 


Dor  6 


G 


K 


Height 
Dia.  at  top 


4 
2% 


4% 
3 


3% 


6%        7% 


8  in. 

51,4  in. 


710 


Per  100  $3.50       5.50       6.00 

Covers  for  above.     Per  100  2.25       3.50      4.00 


8.00     10.00     12.00     13.50     24.00 
5.00       5.50       6.00       8.75       8.75 


Table  giving  size  of  Crucible,  number  to  the  barrel  and  gross  weight. 


SIZE 


No.  per 
Barrel 


Gross  Weight 
per  Barrel 


5  Grammes 900 

10   "   550 

12   "   450 

15   "   400 

20   "    350 

30   "    300 

35   "   275 

E 350 

F 300 

G  or  40  Grammes 200 

I 150 

J 100 

K 75 

L 50 

No.  6  or  D 500 

No.  8 300 

No.  9  .  300 


265 
240 
225 
220 
225 
265 
275 
290 
270 
260 
245 
245 
220 
190 
240 
290 
290 


Crucibles  in  less  than  barrel  lots  25c  to  50c  per  hundred  higher. 


CUSTOMERS  ORDERING  BY  WIRE  WILL  FIND  OUR  "CODE"  ECONOMICAL. 

(See  Page  xviii.) 


128 


THE  DENVER  FIRE  CLAY  COMPANY. 


715 


716 


718 


720-21 


724 


No. 

715 


716 


Crucibles,  Hessian  Sand,  triangular,  in  nests. 
No.  in  Nest  3         5 


Height  of  largest 
Width  on  top 
Nest 


4%  in. 
3%  in. 


$0.10     .15 


Crucibles,  Royal  Berlin  Porcelain,  without  covers,  glazed  inside  and  outside. 

No.      OOP         00         0         1         2         345 

Dia.  ^L  1*4     1% 1%     2         2%     3         3%~in. 

Capacity ^4         %       %     1        1%     3V2     6       10     oz. 

Each 


717       Crucible  Covers  for  above 


$0.09        .12 
.03        .03 


.20      .25 

.04      .05 


.30      .40      .50 


.05      .08      .08 


.60 

.10 


Note: — Upon  request  of  many  of  our  customers  we  also  keep  in 
stock  a  Royal  Berlin  Crucible  of  a  size  between  the  000  and  00,  sim- 
ilar in  dimensions  to  Royal  Meissen  No.  8.  Price  $0.10 

In  ordering,  please  specify  R.  B.  No.  8. 

718  Crucibles,  Royal  Meissen  Porcelain,  without  covers,  glazed  inside  and  outside. 

No.         _1 2  3456789           10       11 

Dia.        "3%     2%  2%     2^4  T%~1%~1%     1%     1           %       %  in. 

Capacity  6        4V2     3^     2        1%     1%     1  %      J4 y8  1-16  oz. 

Each       $0.45      .30  .25      .20      .17      .15      .14      .13    ~A2      ."10      iOJT 

719  Crucible  Covers  for  above.15      .12      .05      .05      .05      .05      .03      .03      .03      .03     .03 


719a     Crucibles,  of  Berlin  Porcelain,  Royal  Berlin  shape,  glazed,  with  covers. 

No.  00         0         1         2         3 

Capacity     13      15      25       45       90  cc. 

Each 
720 


$0.15      .18      .20      .25      .30 


721 
722 

723 
724 


Crucibles,  Unglazed  Porcelain,  Rose's,  with  perforated  cover  and  tube. 
Capacity  %        1        2  oz. 

Each  ~  $0.^0      160      ^90 

Crucible  Tubes  and  Covers  only.35      .40      .70 

Crucibles,  Unglazed  Porcelain,  lipped  with  cover. 
Capacity  125  250  500  cc. 
Each 


.50 


.70 


$0.40 

Crucibles,   Royal    Meissen    Porcelain,  Gooch's,  with   perforated  bottom  and 

cover ;    Meissen  form    $0.40 

Crucibles,  Royal    Meissen    Porcelain,  Caldwell's,  with  cover  and  small  rim 

instead  of  bottom  to  hold  perforated  disk;  conical  form  .50 


THE  DENVER  FIRE  CLAY  COMPANY. 


129 


728 


728a 


729 


729a 


730 


No. 

725 


ity          20 

30 
4 

75 
5 

100 
6 

250 
8 

450  cc. 
10cm. 

$0.40 

.50 

.60 

.70 

1.00 

1.50 

bove       .20 

.25 

.30 

.35 

.50 

.75 

727 


728 


728a 


729 


729a 


Crucibles,   Pure  Solid   Nickel,  for  alkaline  fusions. 
Capac 
Dia. 

Each 


Crucibles,  Pure  Silver,  with  covers.  Same  shape  as  platinum  crucibles. 

Capacity          20        30        50        75        100        150        200  cc. 

Approx.  Wt.     45         60         80       110         150         180         200  grms. 

Per  gramme  $0.10 

Crucibles,  Light  Spun  Iron,  with  cover. 

Capacity  %         1         2         4         8  oz. 

Height"     ~T%         1%~~2~~ 

Dia.     1^         2V8     2^ 

Each        $0.25          ISO AO     £0 J5~ 
Crucibles,  Spun  Copper,  with  cover. 
Caps 
Dia. 
Height 
Each 


3  in. 

3%  in. 


:ity          50 

100 

250      cc. 

2ga 

2 
it              1% 

2% 

!7/8 

3%  in. 

23,4  in. 

$0.60 
,  with  cover. 
:ity          pt. 

.80 

qt. 

1.00 

y2     i 

Each  $2.25       2.50      3.00    4.00    6.00 

Crucibles,  of  pure  fused  Silica,  not  transparent. 

Outside   Measurements,   Inches. 


No. 
C   00 

Height 

Diameter 
at  top. 

.  1% 

Price 
each. 
$0.60 

C    0 

1 

1%   

0.75 

C   1 

.    .     iy8 

0.85 

C.  2 

1  7-16  .  .  . 

2%  

1.00 

C.  3 

1% 

2%   

1.20 

C    4 

2           ... 

2       

1.20 

730 

Crucible,  Normal   School,  Skidmore's. 

For  making  oxygen  from  MnO2;   cal- 

cination  of  chalk,  with  recovery  of  the  expelled  CO2;  manufacture  of 
soda  from  cryolite;  preparation  of  ammonia;  destructive  distillation  of 

coal,  wood  or  other  organic  substances;  capacity,  1^  oz 

Capacity,    6    oz 

Crucibles  of  Platinum.     See  Platinum. 


1.00 
2.00 


130 


THE  DENVER  FIRE  CLAY  COMPANY. 


THE  CASE  LABORATORY  CRUSHER 

(Patented.) 


731-731a 


No. 

731       Crusher,  Case.     The  Case  Laboratory  Crusher   (patented  1903)  is  designed 

to  meet  the  constantly  increasing  demand  for  a  strong  power  driven 
laboratory  ore  crusher.  We  unhesitatingly  recommend  it  as  being 
the  strongest,  fastest  and  best  little  crusher  on  the  market  today.  The 
cuts  above  represent  the  combination  hand  and  power  crusher,  which 
has  the  essential  features  of  strength  and  speed,  and  at  the  same  time 
requires  the  least  power  of  any  hand  crusher  on  the  market.  This 


THE  DENVER  FIRE  CLAY  COMPANY.  131 


731 
No.  731 — Continued. 

is  furnished  with  a  belt  pulley  9  inches  in  diameter,  with  a  2%-inch 
face.  A  speed  of  450  to  500  revolutions,  driven  by  one  H.  P.,  is  rec- 
ommended for  general  use.  Under  these  circumstances  the  crusher 
has  a  capacity  of  from  50  Ibs.  per  hour  to  100  Ibs.  per  hour,  depending 
upon  the  nature  of  the  ore  to  be  crushed.  The  jaw  opening  is  2^  by 
3  inches.  All  parts  are  made  in  exact  duplicate,  and  consequently  re- 
placements can  be  had  at  a  minimum  expense.  The  lower  cut 
shows  the  Case  Crusher  opened  to  clean,  which  is  easily  and  quickly 
accomplished.  It  is  only  necessary  to  give  two  or  three  turns  of  the 
hand  wheel  at  the  front  end  of  the  frame,  which  allows  the  front  jaw 
plate  and  adjustment  shims  to  be  lifted  out.  The  rear  jaw  and  plate 
can  then  be  raised  and  swung  back,  as  shown.  This  cleaning  device 
is  quickly  and  easily  operated,  and  does  not  weaken  the  crusher 
frame  or  leave  any  loose  parts  to  rattle  and  wear.  The  adjustment 
for  fine  or  coarse  crushing  is  made  by  use  of  special  patented  shims, 
which  are  inserted  between  the  front  jaw  plate  and  the  frame.  This 
adjustment  affords  a  variation  of  from  %-inch  to  20  mesh,  is  quickly 
changed,  perfectly  substantial,  and  does  not  alter  the  relative  posi- 
tion of  front  and  back  jaw  plates,  as  it  does  with  crushers  having  a 
rear  adjustment.  The  motion  of  the  movable  jaw  is  such  as  to  give 
it  the  very  best  possible  feed  and  still  not  cake  on  soft  material.  The 
rear  jaw  plate  is  held  by  one  taper  head  bolt  in  the  center  so  that 
when  the  lower  end  becomes  worn  it  can  be  reversed.  The  front 
plate  is  also  reversible.  Weight,  130  pounds. 

Price,  Hand  only  Net  $30.00 

Price,  Power  "       32.00 

Hand  only,  Code  Word,  "Casml."     Hand  and  Power  Code  Word,  "Caspsml." 


132 


THE  DENVER  FIRE  CLAY  COMPANY. 


731a 
Power  only,  Code  Word,  "Cakit."     Light  and  Loose  Pulleys,  Code  Word,  "Calue." 

731a  Crusher,  Case.  Large  size,  for  power  only.  This  is  the  same  as  our  No. 
731,  except  for  size,  and  is  especially  suited  to  mills,  smelters,  sam- 
plers and  others  having  large  samples  to  crush.  Jaws,  4%  inches 
wide;  opening,  3x4%  inches;  capacity,  200  to  300  Ibs.  per  hour.  The 
pulley  is  14  inches  with  a  4%-inch  face.  Floor  space  required,  21  in. 
by  21  in.  Shipping  weight,  350  Ibs. 

Price    Net  $80.00 

Price,  with  tight  and  loose  pulleys "      90.00 


ELECTRIC  MOTOR 

We  are  prepared  to  furnish  upon  application,  quotations  on  gasoline  engines  or 
electric  motors  (of  standard  makes)  to  drive  Case  Crushers  and  other  laboratory  ma- 
chinery. 

In  writing  state  the  machinery  you  wish  to  drive.  In  the  case  of  electric  motors, 
state  whether  it  is  for  direct  or  alternating  current,  the  voltage,  cycle,  and  phase  of  the 
current. 

Shipment  will  be  made  from  Denver  stock. 


THE  DENVER  FIRE  CLAY  COMPANY.  133 


CASE  CRUSHER  PARTS 


731b 


Small   Size  CASE  CRUSHER   PARTS  Large  Size 

X     1      $12.00 Frame    (bare)     $ 

A     2             .50 Cap  for  Shaft   B     2  .50 

A     3             .10 Bolt  for  Shaft  Journal   B     3  .10 

X     4             .75 Cheek    Plates    (pair)    with    Bolts    B     4  1.25 

X     5           2.00 Movable   Jaw    B     5  3.00 

X     6            .75..   Mild  Steel  Plate  for  Movable  Jaw,  with  Bolt  and  Nut   ..B     6  1.00 

X     8            .75 Mild  Steel  Stationary  Jaw  Plate  with  Stud  B     8  1.00 

A  10  .25 Hand  Grip  Nut    

A  11             .25 Shim   to  regulate  size  of  product    B  11  .30 

A  12           4.00 . Steel    Crank    Shaft .B  12S  6.00 

Steel  Crank  Shaft  for  Loose  Pulley  B  12L  7.00 

X  13           1.50 Pitman    B  13  2.50 

A  14             .75 Front    (long)    Toggle    B  14  1.50 

A  15             .75 Back    (short)    Toggle B  15  1.50 

A  16             .25 Toggle   Pin    B  16  .40 

A  17             .25 Spring  for  Toggle  Socket    B  17  .40 

A  18             .10 Cap  Screw  for  17 B  18  .10 

A  19             .10 -. . .    Bolt  for   17    B  19  .10 

A  20  3.CO Hand    or    Fly   Wheel    

Pulley  Fly  Wheel   B  21  7.00 

A  21  4.00 Pulley  Wheel    

Loose    Pulley    B  21L  6.00 

The  parts  with  the  "X"  prefixed  are  different  for  the  different  designs.  In  or- 
dering these  parts,  to  avoid  errors,  state  the  letter  designating  the  style,  viz.,  A,  or  D,  etc. 


134 


THE  DENVER  FIRE  CLAY  COMPANY. 


No. 
734 


734a 


Crushers,  Bucking  Board  and  Muller,  for  quickly  reducing  ore  to  a  fine 
powder,  of  iron  1  in.  thick,  planed  smooth  on  grinding  side,  and  hav- 
ing flange  on  two  sides  \Vz  in.  high.  Supplied  with  either  a  round 
or  flat  faced  muller. 

Size  12x18     18x20     20x24     24x30     24x36     30x36 

Wt.  of  Muller       15          lo  20  25  25         35  Its. 

Bach  ~~  ^$8.00  12700  15700  18.00  19760 25700~ 
Note: — Round  mullers  which  take  regular  axe  handle,  are  always  sup- 
plied (except  the  35-lt>.  muller  with  the  30x36  in.,  which  is  flat);  flat 
mullers  take  pick  handles — see  illustrations  below.  Different  weight 
mullers  can  be  supplied  at  a  proportionate  difference  in  price.  Handles 
included. 

Crushers,  of  Hardest  Chrome  Steel.  Plates  are  18x24  inches  and  weight 
about  115  Ibs.  each.  Rubbers  are  8x7  inches  and  weigh  about  30  Ibs. 
each.  Both  the  face  of  the  plate  and  the  face  of  the  rubber  are  ma- 
chined. Does  not  grind  off  into  the  sample.  Used  by  the  U.  S.  Steel  cor- 
poration for  crushing  iron  ore,  and  recommended  by  the  Chemists' 
Committee  in  their  "Uniform  Methods."  Plate  and  Rubber Net  $45.00 


735a  735b  736 

735  Crushers,  Extra  Mullers,  small,  medium  and  large,  with  best  hickory  han- 

dles.    Per   Ib ' $0.12 

736  Crushers,  Weatherhead's  Patent.     Crusher  and  Pulverizer  combined.     Will 

reduce  ores,  pig  iron,  rock,  clay,  coal,  etc.,  to  fine  powder  in  very 
short  time.  Readily  cleaned;  discharges  material  as  soon  as  pul- 
verized; working  surfaces  chilled.  The  cover  is  made  so  that  it 
may  be  used  as  a  small  hand  mortar,  the  end  of  the  handles  being 
rounded  in  the  form  of  a  pestle.  One  pound  of  pig  iron  at  first  op- 
eration can  be  reduced  in  12  minutes  to  pass  through  sieves  from 
No.  80  to  140.  One  pound  glass  in  71/4  minutes  25.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


135 


QC 
lil 
Q 

Z 

DC 
O 

Hi 


136 


THE  DENVER  FIRE  CLAY  COMPANY. 


THE    ILER    IMPROVED    DISC   SAMPLE   GRINDER 
Open  for  Cleaning 


THE  DENVER  FIRE  CLAY  COMPANY. 


137 


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138  THE  DENVER  FIRE  CLAY  COMPANY. 

ILER'S  DISC  PULVERIZER 

OR 

ILER'S  DISC  SAMPLE  GRINDER 

Patented. 
POWER  ONLY 


This  machine  has  been  constructed  on  the  very  latest  mechanical  principles,  and 
has  the  combined  good  points  of  all  the  Disc  Pulverizers  on  the  market  at  this  time, 
and  many  new  thoroughly  mechanical  features;  therefore,  Assayers  and  Chemists  who 
realize  the  importance  of  having  a  properly  ground  sample  with  no  possibility  of  salting 
will  undoubtedly  decide  on  the  Her. 

It  is  the  most  easily  cleaned,  and  has  the  oscillating  motion  to  the  Discs.  The 
Discs  are  made  convex  and  concave  so  as  to  give  the  best  possible  wearing  surface. 
This  machine  is  constructed  on  such  thoroughly  mechanical  principles  as  to  practically 
do  away  with  the  gearing,  but  to  give  this  oscillating  motion  which  is,  of  course,  very 
necessary  to  prevent  the  grinding  surface  on  the  Disc  from  becoming  concentrically 
grooved.  An  ordinary  8  oz.  sample  can  be  ground  to  the  finest  of  100  mesh  in  less 
than  one  minute,  and  the  machine  can  be  instantaneously  adjusted  to  grind  to  any 
degree  of  fineness  while  running,  its  adjustment  being  effected  by  means  of  a  small 
lever  with  a  lever  locking  device;  for  instance,  orje  part  of  a  sample  could  be  ground 
to  50  mesh,  part  to  100  mesh  and  part  to  200  mesh  while  the  machine  is  in  motion.  On 
account  of  having  the  Discs .  concave  and  convex  we  use  a  smaller  Disc  and  have 
greater  grinding  surface,  and  consequently  this  small  machine  does  more  and  better 
work  in  less  time  than  a  larger  machine. 

It  is  absolutely  dust  proof,  consequently  there  is  no  loss  of  material  and  the 
Discs  wear  to  place.  The  Discs  are  made  of  a  very  hard  gray  chilled  cast  iron  and  may 
be  replaced  at  a  much  lower  cost  than  any  Discs  for  Pulverizing  on  the  market. 

Small  Size. 

Code  Word,  "Her." 

Diameter  of  Discs,  6  inches.  Speed,  350  to  450  revolutions  per  minute.  Net 
weight,  130  Ibs.  Shipping  weight,  140  Ibs.  Total  length,  24  inches.  Total  height,  10% 
inches.  Face  of  pulleys,  21/4  inches.  Total  width,  11  inches.  Diameter  of  pulleys,  10 

inches.     Requires  one-half  horse  power.     Machine  complete $80.00 

Extra  Discs,  per  set 5.00 

Large  Size. 

Code  Word,  "llernine." 

Net  Weight 300  Ibs. 

Diameter    of    Disc    9     " 

Face    of   pulleys    2%" 

Diameter   of   pulleys    14    " 

Horse    Power 2  H.  P. 

Shipping    weight    330  Ibs. 

Length  over  all .' 28%" 

Height   over   all    14^4" 

Width    over    all 14%" 

Complete  Machine   .  . $135.00 

Extra  Discs,  per  set '. 9.40 


THE  DENVER  FIRE  CLAY  COMPANY. 


139 


PRICE  LIST  OF  ILER  DISC  PULVERIZER  PARTS. 


Small  or     Large  or 
6"  Mach.    9"  Mach. 

1.  Main  Frame    $8.65  $16.20            20. 

2.  Oscillator    8.15  15.30           21. 

3.  Hopper 7.70  14.35           22. 

4.  Main  Shaft 9.55  17.90            23. 

5.  Tight  Pulley    3.20  6.00 

6.  Loose  Pulley  3.00  5.60           24. 

7.  Front  Cap    2.55  4.80 

8.  Worm    5.35  10.00            25. 

9.  Thrust  Collar   1.60  3.00           26. 

10.  Adjustable  Bearing 3.00  5.60 

11.  Back  Cap 2.55  4.80           27. 

12.  Revolving  Disc   2.50  4.70 

13.  Stationary  Disc    2.50  4.70           28. 

14.  Connecting  Rod   3.00  5.60           29. 

Two  pieces,  $1.50  each. 

•15.     Worm  Gear 5.35  10.00           30. 

16.  Worm  Gear  Shaft   1.15  2.15           31. 

17.  Oscillating  Shaft   1.15  2.15 

18.  Eye  Bolts  1.70  3.20           32. 

Two  pieces,  85c  each. 

19.  Knob  Nut 1.15  2.15            33. 

Two  pieces,  60c  each. 


Small  or     Large  or 
6"  Mach.    9"  Mach. 

Hopper  Hinge  Pin $0.45  $0.85 

Adjusting  Pin 40  .75 

Oil  Cup  Cover 65  1.25 

Compression  Oil  Cup  .  .     .95  1.80 

Two  pieces,  50c  each. 

Eye  Bolt  Pin 40  .75 

Two  pieces,  20c  each. 

Clamping  Pin 25  .45 

Main  and  Back  Cap  Bolts  .45  .85 

Three  pieces,  15c  each. 

Pivot  Pin   1.50  2.80 

Two  pieces,  75c  each. 

Back  Clamping  Bolt  ...     .40  .75 

Disc  Bolts    55  1.00 

Four  pieces,  15c  each. 

Tight  Pulley  Set  Screw    .25  .45 

Set  Screws  for  No.  1  ...   .55  1.00 

Four  pieces,  15c  each. 

Set  Screws  for  No.  2  . .     .40  .75 

Two  pieces,  20c  each. 

Oil  Plug  for  No.  2 25  .45 


140  THE  DENVER  FIRE  CLAY  COMPANY. 


"CASEITE' 

CUPELS 


739 


Code  Word,  "Caseite." 
MANUFACTURED  CUPELS. 

We  have  had  a  great  many  inquiries  in  the  past  for  a  ready  made  Cupel  that 
will  fill  all  the  exacting  requirements  as  well  as  those  locally  made  from  first  class 
boneash,  and  at  the  same  time  be  sufficiently  strong  to  stand  long  transportation  with- 
out damage. 

After  a  great  deal  of  experimental  work  with  almost  an  endless  variety  of  mix- 
tures we  are  at  last  prepared  to  meet  this  demand  in  the  way  we  should  like  to,  that  is 
to  say,  with  our  complete  recommendation  and  approval. 

The  Caseite  Cupel  is  made  of  a  composition  each  of  the  ingredients  of  which  is 
a  perfect  absorbent  of  lead  oxide.  This  material  makes  a  Cupel,  that  when  cold,  is 
extremely  hard,  and  will  withstand  great  abuse,  but  when  heated  to  approximately  one 

half  cupeling  temperature  becomes   as   soft  and   porous   as  the  most  perfect  boneash 
Cupel. 

We  have  had  the  most  exhaustive  tests  made  in  our  own  laboratory  in  com- 
petition with  our  boneash  Cupels  as  well  as  the  ready  made  Cupels  of  other  manufac- 
turers, and  are  firmly  of  the  opinion  it  is  the  superior  of  anything  as  yet  coming  within 
our  notice,  and  fully  equal  to  the  best  bone  ash  Cupel.  We  are  prepared  to  supply  in  any 
quantity,  put  up  in  boxes  of  twelve,  100  and  500,  packed  carefully  for  shipment  and 
beg  to  quote  the  following  prices: 

Box  of  1  Doz.  100  500 

Size 114 $0.60 $4.00 $3.75  per  100 

"     1V2 75 5.00 4.50    "      " 

"     2      1.00 6.80 6.00    "      " 

" 2V2 1.35 8.00 7.20    "      " 

Special  prices  in  lots  of  1000  or  more. 


THE  DENVER  FIRE  CLAY  COMPANY. 


141 


CUPELS 


No. 


741       Cupels.    Our  XX  brand  of  cupels  are  made  from  the  best  bone  ash  and  have 
all  the  proper  absorbing  qualities. 

Absorbing        10       15       20       30       50      75       150  grammes. 
Dia.  on  top         1         1%     1*4     1%     1%     2          2^  in. 


Perdoz.          $0.25      .30      .35      .40      .45      .60        .75 
Per  100  1.50    2.00    2.25    3.00    3.50    4.00      6.00 


742       Cupel  Moulds,  brass.     Finely  finished. 

Dia.  %         1         1% 


1% 


2     2  Ms  in. 


Each 

743       Cupel  Moulds,  iron. 
Dia. 


$1.75     1.75       2.00        2.25        2.50        3.00      4.00     6.00 


1% 


2     21/2  in. 


Each 


$1.25     1.25       1.35        1.50        1.75        2.00      2.25     3.00 


[LER'S  IMPROVED  CUPEL  MACHINES 


744 

No.  744.  This  machine  is  undoubtedly  the  most  effi- 
cient cupel  machine  on  the  market,  and  with  the  improve- 
ments recently  made  it  has  a  capacity  of  500  cupels  per 
hour,  this  being  accomplished  by  the  rapidity  of  adjustment 
of  the  degree  of  compression,  thus  making  cupels  of  uniform  density  and  size. 

It  is  the  most  easily  operated  machine  on  the  market.     As  you  will  note  from 
the  illustration  it  is  operated  by  foot  power,  thus  leaving  both  hands  free  with  which  to 


142 


THE  DENVER  FIRE  CLAY  COMPANY. 


work.  You  will  note  that  the  density  and  thickness  of  the  cupels  are  regulated  by  one 
small  set  screw  on  the  pedal;  therefore,  those  who  desire  uniform  cupels  and  the  most 
satisfactory  machine  will  undoubtedly  decide  on  an  Her. 

The  bone  ash  properly  moistened  is  placed  at  one  side  on  the  top  of  a  small 
table,  as  shown  in  the  illustration  and  the  mould  is  filled  by  using  one  hand  and  the 
finished  product  is  taken  off  by  the  other,  thus  making  the  machine  very  rapid;  in  fact, 
a  man  may  turn  out  with  this  machine  more  cupels  than  with  any  other  machine 
on  the  market  with  the  least  exertion. 

This  machine  makes  cupels  with  perfect  edges,  and  a  homogeneous  cupel  is  al- 
ways obtained;  therefore  the  advantage  this  machine  has  over  others  is  that  this  is  all 
accomplished  with  two  movements  of  the  foot.  All  dies  are  of  brass  and  the  changes 
of  dies  to  make  the  different  styles  and  sizes  of  cupels  is  extremely  simple  and  takes 
less  than  one  minute.  These  machines  are  in  service  in  the  largest  smelters  and  assay 
offices  in  the  world,  and  are  giving  universal  satisfaction. 

The  Her  Cupel  machine  is  made  in  two  sizes,  one  making  l1^  and  1%  in.  cupels  and 
the  other  making  I1/!,  1%,  1%  and  2  inch  cupels.  The  simplicity  of  construction  of 
the  Her  Cupel  machine  makes  it  possible  for  us  to  sell  them  at  a  very  reasonable  figure, 
as  follows: 

Machine  to  make  1*4  and  1%  inch  Cupels  $25.00 

Machine  to  make  l1^,  1^,  1%  and  2  inch  Cupels   35.00 

Shipping  weight,  40  Ibs.  per  machine. 

The  above  prices  apply  on  machines  packed  and  ready  for  shipment 
f.  o.  b.  Denver,  Colo.,  or  Salt  Lake  City,  Utah. 

Code  Word,  small,  "Ileus." 
Code  Word,  large,  "llcul." 


749 


750 


No. 

747  Cupel  Rake,  iron.     24  in.  long 

748  Cupel   Shovel,   iron.     24  in.   long    

Cupel  Tongs.     See  Tongs  No.  1530. 

749  Cupel  Trays.     Holding  16  Cupels,  with  detachable  handle,  all  iron 

750  Cups,  Miners,  of  agateware. 
Capacity:     2  pt,  50  cts.     3  pt,  75  cts. 


$0.50 
.50 

.75 


THE  DENVER  FIRE  CLAY  COMPANY. 


143 


CYLINDERS 


751 


752 


753 


No. 
751 


752 


753 


754 


755 


Cylinders,   glass,  with   lip. 

Height       5       6       7 
Dia.  1       1%  1^ 


754 


8       10       12 


756 


12 
2 


757 


758 


15       15 
1%     2 


15       18 
2^     2 


18  in. 
Sin. 


Each     $0.15     .20    .25    .30      .35      .40      .45      .50     .55      .70     .80    1.00 


Cylinders,  glass,  with  ringneck. 

Height       5       6       7 
Dia.  1       ly*  1 


8       10       12 


12 

2 


15       15 
iy2     2 


15       18 

2V2     2 


18  in. 
3m. 


Each    $0.15     .20    .25    .30      .35      .40      .45      .50     .55      .70     .80    1.00 

Cylinders,  glass,  with  lip,  double  graduation  in  CC.,  reading  up  and  down. 

Capacity         10     25     50     100     200     250     300     500     1000     2000  cc. 


Each 


$0.30    .40    .50      .60      .80      .90    1.00    1.20      2.20      3.50 


Cylinders,  glass,  with  ground-in  stopper,  double  graduation  in  CC.,  reading 
up  and  down. 

Capacity         10     25     50     100     200     250     300     500     1000     2000  cc. 


Each 


$0.45    .60    .70      .80    1.00    1.20    1.30    1.65      2.40      4.00 


Cylinders,  Nessler's,  for  ammonia  test.  Graduated,  with  even  ground  bottom. 
Grad.  _  50        100        50  and  100        50,  100  and  150  cc. 
Each"  ~~ 


$0.50 


60 


.70 


.80 


755a     Cylinders,   Nessler's,  for  water  analysis,   tall  form,   50   CC.,   with  polished 
75C 


bottom,  lipped,  size  12  x  %-in Each     $0.50 


Cylinders,  Chloride  Calcium.  Plain. 
Height  8        12 


16 


20 


Each 


$0.50        .75      1.20      1.75      4.00 


757 


758 


Cylinders,  Drying,  with  perforated  glass  stopper. 
Height  11         14  in. 

Dia.  l%_   2  in. 

2.25 


Each 


$1.75 


Cylinders,  Mercury  Jars,  with  enlarged  top. 
Height  12         16         18 


20  in. 


Each 


$0.40        .50        .60 


THE  DENVER  FIRE  CLAY  COMPANY. 


DEMIJOHNS 


759 


759a 


No. 

759       Demijohns,  wickered.     The  5-gallon  size  is  oval  and  has  two  handles. 

Capacity          1235  gallons 

Each  $0.50      .75    1.00    1.50 

759a     Demijohns,  "Skeleton,"  for  laboratory  work. 

A  new  container  of  high  merit.  Bottles  are  of  clear,  light  green  glass,  affording 
opportunity  for  minute  and  intelligent  inspection  of  contents.  The  protection  against 
breakage  at  the  bottom  is  perfect,  while  the  four  upright  canes  or  standards  afford 
security  for  the  sides  and  serve  as  substantial  handles.  For  intelligent  laboratory  work 
this  package  has  no  equal. 


Capacity          235  gallons 
Each          $1.00    1.25    1.75 


THE  DENVER  FIRE  CLAY  COMPANY. 


145 


DESICCATORS 


760 


No.       762 


763 


764  766 


760 

760a 

761 

762 

763 

764 


765 


Deflagration  or  Combustion   Spoons,  of  iron., 

Deflagration  or  Combustion  Spoons,  of  brass, 

Desiccators,   Atwater's.     With   triangle 

Desiccators,  Fresenius'.     Flat  top 

Desiccators,  Fresenius'.    Round  top,  with  brass  triangle 

Desiccators,  Schei  bier's.     With  knob  top,  ground  air  tight. 

Dia.  _  4        5        6  in. 

Each  $0.60      .80    1.00 

Desiccators,   Scheibler's.     With   porcelain   plate,  like  No.  772. 


or  1-in.  cup   Each 

or  1-in.  cup Each 


$0.15 

.20 

1.75 

1.00 

1.25 


Dia. 


6  in. 


Each  $1.40    2.QO 

766       Desiccators,   Scheibler's.    With   side   tube   and    stopcock   ground    in. 


Inside 


dia. 


in 


.3.00 


767 


768 


769 


767 


768 


Desiccators,    Fresenius'.     With   stopcock  ground    in   top   tubulature.     Inside 

dia.  5  in $3.00 

Desiccators,  Hempel's.  Very  perfect,  from  the  fact  that  water  vapor  has 
a  lower  specific  weight  than  air  and  therefore  accumulates  in  the 
upper  part  of  a  desiccator,  which  is  overcome  by  placing  the  drying 
substance  in  the  lower  part  of  the  cover. 

Size 4x4      6  x  5  in. 

Each  $3^50       4^50 

769  Desiccators,  Reinhardt's.  This  form  possesses  many  advantages;  the  air- 
tight cover  fits  inside  the  rim  and  therefore  cannot  slip  off.  The  dry- 
ing material  is  placed  in  the  upper  broad  rim,  so  that  all  the  other 
space  is  available  for  drying  purposes.  Drying  space,  6x6  in 5.00 


146 


THE  DENVER  FIRE  CLAY  COMPANY. 


No. 

770 


771 


772 


773 


Desiccator,  consisting  of  a  porcelain  acid  dish  and  bell  glass  ground  air 
tight  to  heavy  glass  plate. 

Dia.  of  bell  jar     6        8  in. 


Each 


$2.25    3.00 


Desiccator  Dishes,  or  acid  dishes,  of  porcelain,  with  partitions. 
Dia.  4%         6%  in. 


Each 


$1.00       1.40 


Desiccator   Plates,  of  porcelain. 

Dia.  3%  5  in. 


Each          $0.80        1.00 
Dialysers.    Low  form,  complete. 


Dia. 


Each 


8  in. 


$2.00    2.50 


774 

775 
776 
777 


Dialysers.  Tall  form,  complete. 
Capacity          qt. 


gal. 


777 


Each  $1.25      1.50 

Diamonds,  for  cutting   glass;    in  handle    $5.00 

Diamonds,  for  writing  on  glass;    in  handle   3.00 

Dies,  Figures.     Of  steel,  for  stamping  bullion,  etc.     Hand  cut,  best  quality. 

Face  1-16         V8         3-16         %         5-16         %         7-16         %  in. 

Set  $O60        JO          .80        1.00        1.20       1.60        2.40       3.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


147 


778a 


780 


780a 


No. 

777a 


778 


778a 


779 


780 


Dies,  Figures,  of  cast  iron,  for  stamping  wood,  soft  metals,  etc. 

Size  %  in Set 

Size   %   in Set 

Dies,  Letters.     Of  steel,  for  stamping  bullion,  etc.     Hand  cut,  best  quality. 
Face  1-16     %     3-16     %     5-16     %     7-16     %  in. 


Set  $1.752.00     2.503.00     3.505.00     6.508.50 

Dies,  Letters,  of  cast  iron,  for  stamping  wood,  soft  metals,  etc. 

Size   V2  in  .............................................  Set 

Size   %   in  .............................................  Set 


Dies,  Steel  Stamp,  i.  e.,  letters  or  figures  in  one  piece. 
Size  ys         %         5-16         % 


in. 


Quoted  upon  application. 

Dippers,  Agateware,  extra  strong,  with  wooden  handles,  for  quicksilver. 

No.  210  small  size,  4%  x  3  in Each 

No.  214  large  size,  6x3%  in Each 


$2.00 
3.50 


6.00 
10.00 


.60 
.75 


780a  Digester  or  Autoclav,  for  sterilizing  under  steam  pressure.  The  boiler  is 
made  of  extra  heavy  copper,  tin-lined,  is  24  inches  deep  and  11 
inches  in  diameter,  with  a  perforated  rack  inside.  The  lid  is  made 
of  cast  brass  and  nickel-plated.  It  is  made  with  a  ground  joint,  no 
washers  being  necessary  to  make  it  steam-tight;  it  is  held  in  posi- 
tion by  six  screw  clamps.  The  apparatus  is  tested  and  guaranteed 
to  stand  pressure  of  50  pounds  to  the  square  inch,  is  provided  with 
a  pressure  gauge,  thermometer  and  safety  valve;  the  latter  is  set 
at  30  pounds,  but  may  be  increased  or  decreased.  There  is  a.  small 
pet  valve  which  must  be  kept  open  until  the  steam  escapes,  thereby 
forcing  all  the  air  out  of  the  boiler.  The  base  is  made  of  sheet  iron 
and  is  8  inches  high;  extreme  height  of  the  apparatus  is  40  inches. 
Price,  including  three-tube  burners  ..Net  50.00 


148 


DISHES 


No. 

781 


782 


783 


781  782  783 

Dishes,  Crystallizing,  glass.     With  flat  bottom  and  straight  sides. 

Dia.          2%     2%     3%     3%     4       5     5%     6%     7V2     8V2     9V2  in. 
Each     $0.10      .15      .18      .19.20    .30      .35      .45      .50      .60      .75 

Dishes,  Crystallizing,  porcelain.     Glazed  inside,  with  flat  bottoms,  straight 
side  and  with  lip. 


Dia. 
Each 


6 


10 


11         12  V2  in. 


$0.60      ISO      1^20  -L50      200 

Dishes,    Evaporating,   glass,   hemispherical.  With  lip. 

Dia.      _  2         2  V2     314  4         4%     5% 
Each 


61/2  in. 


$0.12      .15      .20      .25      .30      .40      .50 


784       Dishes,  Evaporating,  Royal   Meissen  Porcelain.     With  lip. 


785 


No. 
Dia. 
Capacity 

000         00         0         1         2         3         4 
16         141/2  13%  12       11       10         9  in. 
2%       1%     1%     1       %       %  gal  2V2  pts. 

Each 

No. 
Dia. 
Capacity 

$6.50      5.50    4.00    3.00    2.00    1.75    1.40 

5           6         7         8         9       10       11 
7%       61/2     5i/2     5         4V2     31/2     2  1/2  in. 
2          1       %pt     6         4         2         loz. 

Each 

Dishes,    Evaporating,    Royal 
with  lip. 
No. 
Dia. 

Capacity 

$1.00       .80        .55    .40      .30      .20      .15 
Berlin   Porcelain.     Glazed  inside  and  outside, 

000         00         0         1         2         3         4         5 
2%       2%     3         3%     3i/2     3%     4%     4%  in. 
1           2         3         4         5         6         8       10      oz. 

Each               $0.15        .18      .20      .30      .35      .40      .45      .55 

No.                           6         7         8         9         10             11         12 
Dia.                         6         7         8%  10%     12%         14         16  in. 
Capacity               1235           7  pts.        1%       2%  gal. 

Each 

$0.70      .90    1.20    1.75      2.75          3.50      8.00 

THE  DENVER  FIRE  CLAY  COMPANY. 


149 


786 


787 


No. 

786       Dishes,   Evaporating,   Royal    Berlin   Porcelain.  With  lip,  shallow  form. 


No. 
Dia. 
Capacity 

Each 


1234 
2%  3%  3%  4 
1246 


567 
4%     5V2     6  in. 
8       12       20  oz. 


$0.25      .30      .40      .50      .60      .75    1.00 


787 


Dishes,  Evaporating,  German  Porcelain.    Glazed  inside  with  heavy  rim. 

No.             00          01234          5  67          89 

Dia.            16        14        12       11       10       9          8  7    6V2        6    5V2  in. 

Capacity     3         2     1  gal.       3        2     1V2     1  qt.  24     20       16     12  oz. 

Each 


$4.00    3.00    1.80     1.50    1.30    .90  .80  .70    .60      .50    .40 

788       Dishes,  Evaporating,  German  Porcelain.    Glazed  inside  with  light  rim,  shal- 
low. 

No.  00000     0000       000         00  0  1 

Dia.  2          2%       3          3V2  4%  5^  in. 

Capacity  %       1^4       2 3  4  8     oz. 

.15 


Each 


$0.10        .12 


.18        .20 


.25 


789       Dishes,  Evaporating,  Royal   Berlin  shape  No.  785,  but  of  Thuringian  make; 
a  good  dish  for  regular  laboratory  work;  glazed  inside  and  outside. 


No. 

Capacity 

Dia. 

Each 


00  0  1 
1  1%  2 
2%  3  3 


2 
3 
3% 


5 

8  oz. 
4^  in. 


$0.10      .12      .15      .18      .20      .30      .35 


790 


791 


792 


790 


791 


792 


Dishes,  (Basins)  of  Electroquartz,  not  transparent. 

Dia. 
Depth 

.Each 


Bl 

B3 

B5 

B9       B12 

B13 

2 

2% 

3% 

3%         5% 

6  in. 

H 

1 

Ir3* 

1A            2* 

2*  in. 

$1.00 

1.20 

1.30 

1.60        2.90 

3.00 

gatewai 
1 

•e. 

2         3 

4 

567 

8         9 

pt. 

qt.        V2 

1 

234 

5         6  gal. 

No. 
Capacity 

Each        $0.90    1.15    1.50    2.10    3.00    4.20    5.70    9.3011.70 


Dishes,  lead,  shallow  form. 
Dia.  2 

Each 


6  in. 


$0.12      .15      .20      .25      .35      .45 


150 


THE  DENVER  FIRE  CLAY  COMPANY. 


No. 

793 


794 
795 

796 

797 


795 

Dishes,  pure  solid  nickel.  With  lip. 
Dia.  40         60 


796 


80       100       150  mm. 


Each  $0.45        .65      1.00      1.40     2.40 

Dishes,  platinum.    See  platinum. 

Dishes,  pure  silver.    Any  size  made  to  order.    Price  on  application. 
Dishes,    German    Silver,    large.     With   lip    and   counterpoise,   for   weighing 

sugar  samples $2.00 

Dishes,  s.  c.  Moist  Chambers.  With  cover;   dia.  9  in.  inside;  height  21/£  in.       1.50 
Dishes,  Petri's  Culture.  A  double  dish,  very  flat,  loosely  fitting  cover,  dia. 

4    in .30 


799a 


798       Dishes,  Preparation.     These  jars  have  no  contraction  at  the  top;  the  cover 
being  grooved  and  ground  makes  them  air  tight. 
Size  A  B  C  D 

Height          3y2  1%         1  %  in. 

Dia.  2%  23/8         2  1%  in. 


Doz. 
Bach 


$2.00 
.20 


1.80      1.50 
.18        .15 


1.20 
.12 


799 


Dishes,  Staining.  Watch  glass  form.  Beveled  edge  and  flat  bottom,  with 
groove  to  allow  setting  upon  top  of  each  other,  with  ground  mark 

on  edge  for  writing  on  surface Doz.     $1.00 

799a     Dishes,  Aluminum,  flat  bottom,  straight  sides,  for  milk  analysis  and  mois- 
ture determination. 

Size,  2      in.  diameter,  %  in.  high  Each        .30 

Size,  2l/2  in.  diameter,  %  in.  high   Each         .35 

Size,  3      in.  diameter,  %  in.  high  Each        .40 

Drum  Emptier.  For  emptying  acid  drums;  of  glass  with  rubber  connections. 
The  only  satisfactory  piece  of  apparatus  for  emptying  acid  drums 
with  ease  and  safety.  Prevents  all  loss  of  acids  and  avoids  necessity 
of  puncturing  drum  with  air  hole  to  get  steady  flow.  A  great  saving 
to  mills  using  acids  in  these  containers.  Price  Each  4:00 


799b 


THE  DENVER  FIRE  CLAY  COMPANY. 


351 


800 


801 


No. 

800       Drying  Apparatus,  Victor  Meyer's.     Of  brazed  copper,  for  drying  at  a  con- 
stant temperature,  inside  space,  7  cm.  high,  6  cm.  diameter $8.00 


801       Drying   Bath,  double  wall,  of  tin.     With  inlet  for  water  and  opening  for 
thermometer.    Size  6  x  8  in.  . 


3.00 


802       Drying   Bath.     Same,  with  support,  No.  812   4.00 


803 


805 


803       Drying  Bath,  double  wall,  of  copper.    With  inlet  for  water  and  opening  for 
thermometer,  movable  shelf,  and  extra  sheet  iron  bottom. 
Size  6x8         8x10     10x12  in. 


Each 


$7.00 


9.00       13.00 


804  Drying  Bath.     Same,  with  support,  No.  812,  or  on  4  legs. 

Each  $8.00         10.00       14.00 

805  Drying   Bath.     Same  as  No.   803,  with  Kekule's   constant  water  level  at- 

tachment. 

Size  6x8        8x10     10x12  in. 


Each 


$8.50 


10.00       14.00 


806       Drying  Bath.    Same,  with  support,  No.  812,  or  on  4  legs. 
Each  $9.50         11.00       15.00 


152 


THE  DENVER  FIRE  CLAY  COMPANY. 


811 


812 


No. 

807 


808 


810 


811 


812 


Drying  Bath,  double  wall,  of  copper.    With  extra  water  bath  on  top,  open- 
ing for  thermometer,  movable  shelf  and  extra  sheet  iron  bottom. 


Size 
Each 


6x8 


8x10 


10x12  in. 


$8.00       10.00         15.00 
Drying  Bath.     Same,  with  support,  No.  812,  or  on  4  legs. 
Each  $9.00       11.00         16.00 

Drying  Oven  or  Air  Bath,  single  wall,  of  copper.     Opening  for  thermometer, 
movable  shelf,  and  extra  sheet  iron  bottom. 


Size 
Each 


6x8 


8x10 


10x12  in. 


$4.00         6.00         8.00 
Drying  Oven  or  Air  Bath.     Same,  with  support  No.  812,  or  on  4  legs. 
Each  $5.00         7.00         9.00 

Drying  Oven,  with  3  separate  compartments,  of  heavy  copper.  Each  about 
IVz  in.  wide  and  with  two  tubulatures,  extra  ventilators,  the  whole 
resting  on  a  sheet  iron  support  for  taking  in  the  burners  $20.00 

Drying  Oven  Supports,  of  iron.  With  set  screws  by  which  the  oven  is  held 
firmly. 


Size 
Each 


6x8 
$1.00 


8x10 


1.00 


10x12  in. 
1.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


153 


Electric  Drying  Ovens 


No.  812a 


No.   1606 


No.  1608 


The  double  walls  of  these  ovens  are  packed  with  asbestos  to  conserve  the  heat, 
and  when  the  door  is  closed  it  becomes  an  air-tight  box.  Within,  at  the  top  and  the 
bottom  of  the  oven,  are  the  two  heating  plates.  As  soon  as  the  current  is  turned  on, 
these  at  once  become  hot  throughout  their  whole  area  and  give  a  steady,  measured 
heat  to  every  part  of  the  oven,  a  heat  that  comes  from  above  as  well  as  below;  a  heat 
that  is  the  same  every  time  with  the  same  position  of  the  switch,  and  the  effect  can 
be  measured  by  the  clock. 

The  electric  oven  can  be  placed  where  it  is  most  convenient  to  reach  without 
stooping.  In  use  it  will  not  affect  the  temperature  of  the  room. 

No.  Watts.     Price. 

1605  Oven.     Inside   dimensions,   12    in.    wide,    12    in.    deep,    14   in.    high. 

Weighs  30  Ibs.    Three  heats.    Four  feet  cord  and  plug  switch      1100     $20.00 

1606  Oven.     Inside   dimensions,    19    in.    wide,    12    in.    deep,    13    in.    high. 

Weighs  60  Ibs.     Three  heats.  Four  feet  cord  and  plug  switch      1600      25.00 

1608  Oven.     Inside  dimensions,  15  in.  wide,  18  in.  deep,  11%   in.  high. 

Weighs  75  Ibs.     Three  heats.     Four  feet  cord  and  indicating 

snap  switch  on  front  ........................................      1600       40.00 

1609  Oven.     Inside  dimensions,  15  in.  wide,  18  in.  deep,  11%   in.  high. 

Weighs  76  Ibs.  Same  style  as  No.  1608  with  thermometer. 
Three  heats.  Four  feet  cord  and  indicating  snap  switch  on 
front  ......................................................  1600  45.00' 

1610 


Oven.  Inside  dimensions,  21%  in.  wide,  19  in.  deep,  13  in.  high. 
Weighs  115  Ibs.  Three  heats.  Four  feet  cord  and  indicating 
snap  switch  on  front  ........................................  2400  60.00 


154 


THE  DENVER  FIRE  CLAY  COMPANY. 


815 


No. 

813       Emery  Cloth 


814  Emery    Paper 

815  Files,  rattail.     Round  with  fine  points. 

Length         345 


.Sheet    $0.10 
.  Sheet        .05 


8  in. 


Each      $0.12          .15          .18          .20          .25 


816 

816       Files,  triangular.    For  cutting  glass  tubing. 
Length        345 


Each      $0.12 


.15 


.18 


.20 


.25 


817       Files,  flat.    Best  double  cut. 
Length        3 


817 


Each      $0.12          .15 


.18 


.20 


8  in. 


.25 


818       File  Handles Doz.         .50 


THE  DENVER  FIRE  CLAY  COMPANY. 


155 


FILTER  PAPER 


819-820 


821-822 


Cut  in  round  filters,  100  filters  in  a  package,  and  in  sheets  of  special  sizes. 


No. 

819       Filters,  D.  F.  C.  Co.    Strong  and  uniform  in  texture;  excellent  for  clear  and 
rapid  filtration. 

Dia.  4  5  6  7  8  in. 


White,  per  100         $0.12       .15 


.20 


.26 


.33 


820       Filters.       Gray,  per  100  .11  .14          .18          .24          .28 

In  sheets,  size  19x19  in.,  white Ream,  $7.00;    Quire     $0.40 

In  sheets,  size  19x19  in.,  gray Ream,    6.00:   Quire        .35 


821       Filters,  Prat-Dumas  &  Co.,  French,  round  cut,  white. 

No.  7       10       13       15       19       25       33       40       45       50 

Dia.  _  3         4         5         6         8       10       13       15       18       20  in. 
Per  100  $0.10      7f8      ^20      i25      i30      AO      [60      .80    1.00    1.20 
In  sheets,  size  21x17  in  .....................  Ream,  $5.00;   Quire 


822 


823 


Filters,  Prat-Dumas  &  Co.,  French,  round  cut,  gray. 

No.  15  19  25  33  40  45  50 

Dia.  .      6  8          10          13          15          18          20  in. 

Per  100    $0.20          !25          ISO          [50          JO          190        1/10 

In  sheets,  size  21x17  in  .......................  Ream,  $4.00;  Quire 

Filters,  Baker  &  Adamson's.  Washed  in  hydrochloric  and  hydrofluoric  acid, 
giving  the  lowest  ash  of  any  filter  paper  on  the  market.  Put  up  in 
boxes  holding  100  round  filters.  "Double  Washed." 

Dia.  5%  7  9  11          12V2  15cm. 

Ashes,  1  filter     .00001     .00002     .00003     .00005     .000065     .000093  grm. 


Per  100 


$0.40 


.50 


.65 


.80 


1.00 


1.20 


824 


Filters,  Baker  &  Adamson's. 
Washed." 

Dia.  5V2 


Washed  in  hydrochloric  acid  only.     "Single 


11 


Per  100 


$0.15 


.30 


.60 


15  cm. 
~T85 


.30 


.25 


156 


THE  DENVER  FIRE  CLAY  COMPANY. 


827 


No. 

825       Filters,  Schleicher  &  Schuell's,  S.  &  S.  No.  595.    A  good  light  paper,  free  of 
chlorine,  grained  surface,  round  filters. 

Dia.  5%         7         9       11       12%       15       18%       24       32  ctm. 

Per  100        $0.12      .15      .20     .23        .25        .30        .40        .60     1.00 

In  sheets,  47x54  ctm Ream,  $10.00;   Quire     $0.60 

826.       Filters,  S.  &  S.  No.  597.    A  heavy  paper,  perfectly  white  and  quick  filtering. 
Round  filters. 

Dia.  5%         7         9       11       12%       15       18%       24       32  ctm. 


Per  100        $0.15      .20      .25     .30        .35        .40        .55        .75     1.15 

In  sheets,  58x58  ctm Ream,  $18.00;  Quire 

827       Filters,  S.  &  S.  No.  589,  "White  Ribbon."     Washed  with  hydrochloric  and 
hydrofluoric  acid;  filtering  quickly  and  retaining  BaSO4. 
Dia.  5%  7  9          11       12%  15  ctm. 


Per  100     $0.60 


.70 


.90        1.10        1.35        1.60 


828       Filters,  S.  &  S.  No.  589,  "Black  Ribbon."     Washed  with  hydrochloric  and 
hydrofluoric   acid;    prepared    especially   for   use    in    laboratories   for 
metallurgy.     Round  filters,  ashes  same  as  No.  589  regular. 
Dia.  5%  7  9  11       12%  15  ctm. 


Per  100     $0.60 


.70 


.90        1.10        1.35        1.60 


829       Filters,  S.  &  S.  No.  590.     Washed  with  hydrochloric  and  hydrofluoric  acid, 
the  washing  having  been  carried  to  the  utmost  limit.     Round  filters. 
Dia.  5%  7  9  11       12%  15  ctm. 


Per  100     $0.75 


.80        1.15        1.45        1.65 


2.00 


829a     Filters,  S.  &  S.  No.  588,  Folded.    Entirely  free  from  chlorine;  always  ready 
for  use;  packed  in  neat  boxes  of  100  each. 
Dia.  12%  18%  24  ctm. 


Per  100     $0.35 


.50 


.75 


1.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


157 


830-833 


830-833 


No. 

830       Filters,  Munktell's  Swedish  No.  0.    Washed  with  hydrochloric  acid,  remov- 
ing traces  of  iron,  alumina,  lime,  etc.;  round  filters. 


Dia. 


5% 


11       12% 


15       18%  ctm. 


Per  100     $0.20          .27 


.42 


.55 


.63 


.85        1.25 


831       Filters,  Munktell's  Swedish  No.  1  F.    Leaves  the  smallest  amount  of  ash  of 
any  unwashed  paper;  round  filters;  5  packages  in  a  birch  bark  box. 


Dia. 


5% 


11       12% 


15       18%  ctm. 


Per  100     $0.11          .16          .25          .30          .40          .50          .75 

In  sheets,  48x48  ctm Ream,  $20.00;   Quire     $1.20 

832       Filters,  Munktell's  Swedish  No.  2.    A  superior  paper  for  laboratory  work; 
round  filters,  5  packages  in  a  birch  bark  box. 


Dia. 


5% 


11       12% 


15       18%  ctm. 


Per  100     $0.10          .13          .20         .26          .31          .40          .53 

In  sheets,  48x48  ctm : Ream,  $17.00;   Quire       1.00 

833       Filters,  Munktell's  Swedish  No.  3.    A  paper  of  superior  quality,  heavier  than 
No.  2,  filters  rapidly;  round  filters. 


Dia. 


5% 


11       12% 


15       18%  ctm. 


Per  100     $0.08          .10          .15          .18          .24          .32          .41 

In  sheets,  48x48  ctm Ream,  $14.00;   Quire 


.80 


158 


THE  DENVER  FIRE  CLAY  COMPANY. 


835 


836 


837 


No. 

834 


835 

836 

837 


7 

16 
2 


18 
3 


9       10 
20       22  in. 
4     5%  gal. 


Filter  Bags,  best  white,  s.  c.     "Felt  Filters." 

No.  123456 

Dia.  7         8         9       11       13       14 

Capacity      %       %       %        1    1%     1% 

Each         $0.50      .60      .70    1.00    1.25    1.50    1.75    2.00    2.50    3.50 

Filter  Case,  of  tin,  to  protect  round  filters  from  dust;  for  6  sizes,  5y2  to  15 

ctm.  diameter Each    $3.00 

Filter  Dryer,  of  porcelain,  for  drying  precipitates  on  the  filter Each       1.50 

Filter  Rings,  of  porcelain,  as  support  for  funnels  over  beakers,  etc. 

2  arms,  25c ;   3  arms .35 


838  Filter  Press,  experimental,  round  pattern,  for  laboratory  use,  built  to  stand 
a  pressure  of  150  pounds  to  the  square  inch;  made  with  flat  plates  and 
frames,  so  that  filter  paper  or  cloth  can  be  used;  of  iron,  with  brass 
valves  fitted  to  pump,  weight  about  125  Ibs.  Price Net  60.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


159 


No. 
839 


New  Laboratory  Filter  Press. 


This  Laboratory  Filter  Press  is  a  complete 
working  model  of  the  highest  type  of  Filter 
Press.  Each  plate  presents  one  square  foot 
of  filtering  area  and  the  chamber  has  a  ca- 
pacity of  one  twenty-fourth  of  a  cubic  foot. 
There  are  six  chambers,  so  that  the  exposed 
filtering  area  is  six  square  feet  with  a  capac- 
ity for  solids  of  one-quarter  cubic  foot.  It  is 
arranged  so  that  the  filtered  material  may 
839  be  discharged  through  internal  ports  without 

exposure  to  air,  or  discharged  into  an  open  trough,  and  it  is  equipped  with  ports  for 

absolute  washing  or  extraction. 

There  is  supplied  with  the  Press  when  desired  a  specially  constructed  Montejus 
for  feeding  the  Press,  which  is  much  more  convenient  than  a  pump  where  compressed 
air  is  available. 

Price  of  Filter  Press  $100.00 

Price  of  Montejus  30.00 


840 
No. 

840       Filter  Plates.     Porcelain,  with  small  holes. 
Dia.  2456 


Each     $0.15 


.20 


.25 


.30 


.45 


840a     Filtering  apparatus,  Fitzgerald's  Constant  Level. 

The  apparatus  works  the  same  as  inverting  a  flask  con- 
taining the  liquid  to  be  filtered  over  a  funnel  with  its  filter 
paper,  having  the  opening  of  the  flask  a  little  below  the 
edge  of  the  paper,  but  does  the  work  more  conveniently  and 
accurately.  When  wanted  for  use  it  is  set  up  as  illustrated, 
with  the  lower  opening  about  three-sixteenths  of  an  inch 
below  the  edge  of  the  paper.  The  glass  rod  is  pushed  down 
until  the  ground  stopper  closes  the  opening.  The  rubber 
stopper  is  then  removed  from  the  side  opening  and  the 
liquid  to  be  filtered  is  poured  in.  The  glass  rod  is  then 
gently  raised  till  enough  liquid  has  entered  the  funnel  to 
close  the  lower  opening.  At  this  point  the  stopper  is  re- 
placed in  the  side  opening  and  rod  raised  an  inch  or  two. 
The  level  of  the  liquid  in  the  funnel  starts  to  recede  at 
once,  exposing  the  lower  opening,  allowing  air  to  enter  at 
this  point,  with  the  consequent  replenishing  of  the  liquid 
to  the  funnel.  After  a  filtration  is  made  the  precipitate 
may  be  washed  in  like  manner  with  distilled  water. 

A  great  variety  of  work  can  be  done  by  this  useful 
little  device  and  it  is  especially  valuable  when,  as  fre- 
quently happens,  the  chemist  has  no  time  to  complete  a 
filtration  by  hnnd  before  leaving  for  home  at  night  and  can 
put  the  liquid  in  the  apparatus  before  leaving  the  labora- 
tory and  find  it  filtered  next  morning. 

Price   Net    $2.50 


10  ctm 


840a 


THE  DENVER  FIRE  CLAY  COMPANY. 


FILTERING  PUMPS 


No. 

841 

842 

842a 

843 

844 

845 


Filtering  Pumps,  Geissler's.    With  valve,  the  glass  parts  only. 

Filtering  Pumps,  Finkner's.     Glass 

Filtering  Pumps,  Finkner's.     Glass,  double  suction 

Filtering  Pumps,  Muencke's.      Glass 

Filtering  Pumps,  Fischer's.     Glass,  plain 

Filtering  Pumps,  Fischer's.     Glass,  with  2  stopcocks 


$1.50 
1.20 
1.30 
1.20 
1.00 
3.00 


Filtering   Pumps,  Chapman's. 

Size       Small 


All  brass. 
Large 


847 


848 

848a 

849 


850 


Each     $1.40  1.80 

Filtering  Pumps,  Chapman's  Couplings. 
Size      Small  Large 

.40 


Each     $0.30 

Filtering   Pumps,   Richards'. 

Filtering  Pumps,  Richards'.     Brass,  extra  large 

Filtering  Pumps,  or  Universal  Steam  Jet  Laboratory  Exhauster,  with  %-inch 
connections,  requiring  for  operation  a  volume  of  steam  equal  to  the 
evaporation  of  12  pounds  water  per  hour;  complete  with  gauge  and 
stop  and  check  valve Net 

Finger  Cots.  Pure  gum,  thin Doz. 

Pure  gum,  thick Doz. 


Brass,   of  superior  make $2.00 

7.00 


12.00 
.50 
.50 


THE  DENVER  FIRE  CLAY  COMPANY. 


161 


FLASKS 


851 


852 


852a 


853 


854 


855         856 


No. 

851 


852 


852a 


853 


853a 


853b 


854 


855 


856 


Flasks,  chemical.    "Resistance  glass,"  vial  mouth,  flat  bottom,  well  annealed. 
Capacity  1  2  4  6  8  12  16  24  oz. 


Each  $0.08  .10  .12 
Capacity  32  oz.  3  pt.  V2 
Each" 


.15 


.18          .20 

1  gal. 


.25 


.30 


$0.35 


.40 


.45 


.60 


.80 


Flasks,  chemical.    "Resistance  glass,"  flat  bottom,  ring  neck  to  bear  corking. 

Capacity  4         6        8       12       16       24       32  oz.  3  pt.  %       %         1  gal. 


Each  $0.12      .15      .18      .20      .25      .30      .35      .40       .45      .60 

Flasks,  chemical.     "Resistance  glass,"  round  bottom,  vial  mouth. 
Capacity  2  4  6  8          12          16          32  oz. 

Each  $0.10 


.80 


.12 


.15 


.18 


.20 


.25 


.35 


Flasks,  Erlenmeyer's.     "Resistance  glass." 

Capacity  1         2         4         6         8       12 


16       24       32  oz. 


gal. 


Each  $0.08      .10      .12      .15      .18      .20      .25      .30      .35 


.50 


Flasks,  Erlenmeyer's.     Jena  Glass. 
Capacity  50        100        200 


300         500 


600  cc. 


Each     $0.10          .15 


.20 


.25 


Flasks,  Erlenmeyer's,  with  glass  stoppers. 
Capacity  4  8  16 


.30 


32  oz. 


.35 


Each 


$0.40 


.50 


.65 


.80 


Flasks,  copper  determination, 
and  broad  flange. 

Capacity  2  4 


"Resistance  glass,"  pear-shaped,  wide  mouth 


16  oz. 


Each  $0.15 
Doz.       1.50 


.18 
1.60 


.20 
1.80 


.25 
2.00 


.30 
3.00 


Flasks,  conical,  with  lip.     Wide  opening  for  precipitations,  etc. 
Capacity  4  8          16  oz. 


Each 


$0.20 


.25 


.30 


Flasks,  parting,  or  assay. 
Capacity        1 


Conical  form,  with  ring,  flat  ground  top. 
2  4  6  8  oz. 


Each 
Doz. 


$0.12 
1.20 


.15 
1.50 


.18 
1.80 


.20 
2.00 


.25 
2.50 


162 


THE  DENVER  FIRE  CLAY  COMPANY, 


No. 

857 


858 
859 


859a 
860 

860a 

861 

862 

863 

863a 


857 


862 


863 


863a 


864 


Flasks,  parting.  Colorado  form,  pear-shaped. 
Capacity  %     1     2  oz. 

Each  $0.10    .12    .15 
Doz.    1.00   1.20   1.50 

Flasks,  parting.     Montana  style.     Capacity  1  oz 

Flasks,  Low's.     For  copper  determination,  with  funnel  top. 

Capacity,  4  oz Each 

Capacity,  6  oz Each 

Flasks,  Low's  form.     For  treating  insoluble  residues,  with  funnel  top. 

Capacity,  4  oz Each 

Flasks,  digesting.     Bohemian  glass,  for  Kjeldahl's  nitrogen  determination. 
Capacity  200  250  500  750  1000  cc. 

Each     To.20  .25  .35  .40  .50 

Flasks,  digesting,  Kjeldahl's  Jena  Glass. 

Capacity  200  300  500  800  1000  cc. 


Doz.     $1.20 


.15 
.20 

.15 


Each       $0.25  .30 

Flasks,  extraction  or  carbonic  acid. 
Capacity  2  4 


.40  .50  .60 

With  extra  wide  and  low  necks. 
6  8  oz. 


Each  $0.12  .15  .20  .25 

Flasks,  filtering,  conical,  with  side  neck.    For  use  with  filter  pump. 
Capacity  8  16  32  oz. 

Each  $0.35  .45  .60 

Flasks,  filtering,  Bunsen's.    Conical,  very  heavy  glass  to  withstand  pressure. 
Capacity  16  32  oz. 


Each     $0.35  .50 

Flasks,  filtering,  Walther's.    For  use  with  rubber  rings. 
Capacity  8  16  32  oz. 


Complete,  each  $0.75  1.00  1.25 

864       Flasks,  generating,  s.  c.    Gas  bottles. 

Capacity     8  16  24  32  oz. 


Each     $0.20 


.25 


.30 


.35 


THE  DENVER  FIRE  CLAY  COMPANY. 


163 


865 


866 


867 


868 


869 


871 


No. 

865 

866 

867 
868 

869 
870 


Flasks,  fractional  distillation.     With  side  tube. 

Capacity  2  4  8  16 


32  oz. 


Each  $0.20 


.25 


.30 


.45 


.65 


Flasks,    pressure, 
stopper. 

Capacity  100 


For   digestions,   of   heavy   glass,    well   annealed,    with   patent 
150  200  cc. 


Each      $0.40 


.50 


.60 


Flasks,  polarization,  Kohlrausch's.    With  mark  on  neck. 

Capacity  50  100  200  200.6         201.4 


401.2  cc. 


Each     $0.30 


.40 


.50 


.55 


.60 


.80 


Flasks,  sugar  flasks.    With  two  marks  on  neck. 

Capacity     50  and  55         100  and  110        200  and  220  cc. 


Each 


$0.25 


.30 


.50 


$0.60 


Flasks,  sugar  flasks,  after  Stift,  with  funnel-shaped  neck,  capacity  201.2  cc. 

Each 
Flasks,  volumetric,  "Litre  Flasks."  Most  accurately  graduated. 

Capacity  10         25         50       100       200       250       300       500     1000     2000  cc. 

Each 


871       Flasks,  volumetric. 


872 


873 


874 


i     $0.15 

.18 

.20 

.25 

.30 

.40 

.45 

.50 

.65 

1.00 

trie.    With 
icity  10 

glass 
25 

stopper. 
50       100 

200 

250 

300 

500 

1000 

2000 

cc. 

i     $0.20 

.25 

.30 

.35 

.40 

.50 

.55 

.65 

.80 

1.20 

Each 

Flasks,  volumetric,  neck  with  dark  enameled  stripe  on  white  enameled  background, 
giving  a  definite  meniscus. 

Capacity  100  250  500  1000  2000  cc. 


Each       $0.40 


.50 


.75 


1.00 


1.50 


Flasks,  normal  volumetric,  with  in  and  out-pouring  mark. 
Capacity  250  500  1000  cc. 


Each      $0.75 


1.00 


1.25 


Flasks,  Giles,  of  1100  cc.  capacity;  graduated  at  1000  and  1100  cc.    For  use 

in  making  up  normal  solutions   $1.50 


876     Flask  Heater,  Electrical. 

For  laboratory  use,  ring  top.  It  is  substan- 
tially made  of  copper,  fitted  with  heater  with 
controlling  switch,  and  is  intended  for  the  many 
operations  where  a  gentle  or  moderate  constant 
supply  of  heat  is  required. 

The  over-all  diameter  is   eight  and  one-half 
inches,  and  it  stands  four  inches  high. 
3  heats;   500  watts   Price  $12.00 


No.  876. 


164 


THE  DENVER  FIRE  CLAY  COMPANY. 


FORCEPS 


Lii 

881-2 


885a 


887 


890 


brass,  bent  ends   $0.20 

nickel-plated,  bent  ends   25 

nickel-plated,  straight  ends,  with  ivory  tips   60 

nickel-plated,  bent  ends,  with  ivory  tips   60 

nickel-plated,  with  fine  points,  non-magnetic 25 

nickel-plated,  extra  stout,  straight   25 

nickel-plated,  especially  adapted  for  fine  weights 75 

Plattner's  nickel-plated,  forceps  on  both  ends,  with  platinum  tips  . .   4.00 

French  style,  with  heavy  platinum  tips  4.00 

Goosenecks,  nickel-plated,  6  inches  long 40 

steel,  plain,  for  holding  lead  button  while  slagging. 

Size 

Each 
Doz. 


$0.10 
1.00 


.12 
1.20 


.20 
2.00 


.30 
3.00 


.40 
4.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


165 


FUNNELS 


903 


904a 


I 
905 


906 


Funnels,  best  German  glass.    Angle  60°,  stems  ground  to  a  point. 

Dia.  1V2         2  21/2         3  3^         4  5  in. 


Xo. 
901 


Each    $0.30          .40  .50  .65        1.00 

902       Funnels,  glass,   plain,  pressed. 

Dia.            4             5  6  7  in. 

Capacity  4            8  16  32  oz. 


Each 
Dia, 

$0.08 
6 

.10 

7 

.12 

8 

.15 
9 

.18 

10 

.20 
12 

in. 

.25 

1.50 


Each     $0.10         .12         .15 


.20 


902a     Funnels,  glass,  plain,  stemless,  for  sugar  analysis. 
Dia.  3%  in.  4  in. 

Doz. 


$1.50 

903       Funnels,  glass,  ribbed,  pressed. 
Dia.  4  5 


2.00 


Capacity    4 


6  7 

8  oz.        pt.       qt. 


8% 


10  in. 
Igal. 


Each     $0.12 


.15 


.20 


.25 


.40 


.70 


903a     Funnels,  glass,  ribbed,  stemless,  for  sugar  analysis. 
Dia.  4  in. 

Doz.  $2.00 

904a     Funnels,  quick  filtering.     With  6-in.  stem  with  loop. 
Dia.  2%  2%  Sin. 


Each 


$0.25 


.28 


.30 


905       Funnels,   Bunsen's.     With  thin  and  extra  long  stems,  top  ground  even,  and  stem 
ground  to  a  point,  angle  60°. 

Dia.         11/2  2         2y2         2%  3         3%  4  in. 


Each    $0.12 


.14 


.16 


.18 


.20 


.25 


.30 


906       Funnels,  glass,  with  bulb.     For  filtering  through  glasswool  or  asbestos. 
Dia.  6  8  in. 


Each    $0.50 


.75 


166 


THE  DENVER  FIRE  CLAY  COMPANY. 


No. 
907 


908 


908a 


909 


910 


907 


908a 


909 


910 


Funnels,  glass,  Victor  Meyer's.     To  suspend  over  evaporating  dishes,  with 
tubulature. 

Dia.  6  8          10  in. 


Each        $1.25        1.50        1.75 

Funnels,  porcelain,  plain,  with  handle. 

Dia.  456 


7  in. 


Each        $0.40 


.70        1.00        1.40 


Funnels,  porcelain,  ribbed  inside,  with  handle. 

Dia.  4  5  6  7  in. 


Each        $0.50 


.80 


1.25        2.00 


Funnels,    porcelain,    Hirsch's.     For   filtering   by   pressure,    with    fixed    perforated 
porcelain  plate. 

Dia.  2%         3y2  in. 

Each 


$0.50          .7 

Funnels,  porcelain,  Buechner's. 

walls. 

Dia.  4  6 


With   fixed   perforated  porcelain   plate   straight 
Sin. 


Each        $1.25        2.00        3.00 


911 


912 


913 


912 

Funnels,  agateware. 

Capacity    y2  pt. 

Each  $0.35 

Funnels,  hard  rubber. 

Capacity    4 


pt.         qt. 


Igal. 


.40 


.45 


.50 


16 


.60 


32  oz. 


Each    $0.40 


.50 


.60 


.70 


.80 


Funnels,  porcelain,  perforated,  small  holes. 
Dia.  456 


Each    $0.65 


.90 


1.40        1.80 


913a     Funnels,  porcelain,  perforated,  with  large  oval  holes 
Dia.  4  5  6  Sin. 


Each    $0.65 


.90        1.40 


1.80 


913a 


THE  DENVER  FIRE  CLAY  COMPANY. 


167 


n 


914 


915  916 


917 


919 


920 


No. 

914 


915 


916 
917 


918 


919 


920 


Funnels,  Separator/,  open  top,  usual  form,  angle  60°,  with  stopcock. 
Dia.  3  4  5  6  7  in. 


Each    $1.25        1.50        1.75        2.50        3.00 
Funnels,  Separator/,  cylindrical  shape,  with  stopcock. 

Capacity    2  4  6  8  oz. 

Each      $1.00        1.10        1.20        1.40 

Funnels,  Separator/,  cylindrical,  stoppered,  graduated  100  cc.  in  1  cc $2.00 

Funnels,  Separatory,  globe  shape,  light  stoppered. 

Capacity      2  4  6  8          16  oz. 

Each          $1.00       1.20        1.35        1.50       2.00 
Funnels,  Separatory,  globe  shape,  heavy  glass,  stoppered. 

Capacity        pt.         qt.  Vz  1  gal. 

Each 


$2.00       2.50        3.00 
Funnels,   Separatory,   Squibb's,   stoppered. 
Capacity    4  8          16  oz. 


4.00 


Each    $1.25        2.00        2.50 

Funnels,  Dropping,  Walter's.     For  examining  single  drops.     Capacity,  60  cc. 
Each  . 


1.50 


THE  DENVER  FIRE  CLAY  COMPANY. 


921 


922 


923        924       925     926  927          928 


No. 
921 
922 
923 


924 


925 
926 

927 


928 


Funnels,  tin,  Plantamour's.     For  hot  filtrations,  5%  in.  on  top  inside $2.00 

Funnels,  copper,  on  three  iron  legs.     For  hot  filtrations,  dia.  6  in 4.00 

Funnel  Tubes,  thistle  top. 

Length       8           10  12           15  in. 


Each    $0.06          .08          .10          .12 
Funnel  Tubes,  conical  top. 

Length     10          12          15          18  in. 


Each  $0.10  .12  .15  .20 

Funnel  or  Safety  Tube,  bent;  thistle  top 

Funnel  or  Safety  Tube,  bent;  conical  top 

Funnel  or  Safety  Tube,  with  bulbs:  funnel  top. 

With  123  bulbs. 


.20 
.20 


Each    $0.20 
Funnel   Tubes.     Vogel's.  . 


.25 


.30 


.40 


THE  DENVER  FIRE  CLAY  COMPANY. 


169 


THE    LARGEST    MANUFACTURERS    OF    FURNACES    IN    THE    WORLD. 

TILE    LINED    MUFFLE    FURNACES 

FOR    COAL,    COKE,   WOOD   OR    CRUDE    OIL. 

Makers  of 

MUFFLE,   CRUCIBLE,   COMBINATION    AND    MELTING    FURNACES    FOR 
COAL,  COKE,  WOOD,   GASOLINE,   GAS,  AND   CRUDE   OIL. 


fit 


Fig.  1 

COAL,   COKE,   WOOD   AND   CRUDE    OIL    FURNACES. 

The  comparative  cheapness  of  soft  coal  as  a  fuel,  combined  with  the  great  capacity 
of  these  tile-lined  furnaces,  has  resulted  in  a  steadily  increasing  demand  for  them,  to 
meet  which  we  have  designed  a  complete  line,  taking  the  various  sizes  of  muffles  shown. 
We  have  sold  hundreds  of  these  furnaces,  and  they  are  giving  entire  satisfaction.  We 
have  yet  to  receive  a  single  complaint  regarding  them. 

Where  wood,  coke  or  crude  oil  only  is  available,  we  also  build  in  several  sizes, 
furnaces  for  these  fuels,  of  the  same  general  design  as  the  coal  furnaces. 

Figures  1,  2  and  3  show  the  two-muffle  furnace.  The  portions  which  are  dotted 
are  special  fire  clay  tile,  each  tile  having  an  individual  letter,  so  that  it  can  be  easily 
determined  where  each  tile  belongs  by  referring  to  the  blue  print,  which  is  supplied 
with  the  furnaces.  On  this  account  the  construction  is  simple;  any  brick  mason  can 
set  it  up  in  half  the  time  required  for  a  furnace  lined  with  brick,  saving  in  the  cost  of 
the  construction  twice  over  the  small  additional  cost  of  the  tile  over  the  fire  brick.  Then, 
when  the  furnace  is  built,  there  is  no  danger  of  error  in  construction,  and  it  is  sure  to 
give  entire  satisfaction.  Moreover,  the  tile  lining  being  more  durable,  it  is  much 
cheaper  in  the  long  run.  The  lined  sections  in  the  figures  indicate  the  ordinary  red 
or  building  brick.  Many  times,  in  re-lining  these  furnaces,  it  is  not  necessary  to  tear 
down  anything  except  to  break  an  opening  in  the  back  wall  of  the  red  brick  jacket, 
through  which  the  old  tile  are  taken  out  and  the  new  ones  set  into  place. 


170 


THE  DENVER  FIRE  CLAY  COMPANY. 


Fig.  2 


Fig.  3 


The  regular  stock  size  of  the  one  and  two-muffle  furnace  is  made  to  fire  from  the 
back,  i.  e.,  the  side  opposite  the  muffle  opening.  Firing  this  way  the  heat  is  more  even, 
and  controlled  much  better  than  when  fired  from  the  side,  in  which  case  the  side 
opposite  the  fire  door  is  usually  the  hottest.  However,  if  a  back-fire  furnace  cannot  be 
used,  inform  us  of  your  wants  and  difficulties,  and  we  can  probably  overcome  them. 
Full  particulars  regarding  these  furnaces  will  be  gladly  supplied  any  prospective 
customer. 

The  single-muffle  furnace  is  similar  to  the  two-muffle  one  shown  in  figures  1,  2 
and  3,  except  that  it  is  the  height  of  one  muffle  lower. 


THE  DENVER  FIRE  CLAY  COMPANY. 


171 


Fig.  5 

Figures  4  and  5  show  our  three-muffle  coal  furnace,  which  is  also  made  of  special 
fire  clay  tile  lining,  ready  to  set  into  place,  each  tile  having  an  individual  letter.  These 
furnaces  you  will  note  are  fired  from  the  side. 

The  price  of  the  following  tile  lined  furnaces  includes  the  special  fire  clay  tile 
lining  as  indicated  by  the  dotted  sections,  and  the  necessary  fire  clay  to  set  it  up,  also 
the  iron  work,  including  the  grate  bars,  grate-bar  supports,  an  iron  shelf  in  front  of  the 
muffle,  brackets,  angle  iron  and  binding  rods,  fire-box  and  ash-pit  doors — in  fact,  every- 
thing necessary  except  the  red  brick  jacket,  and  the  fire  brick  necessary  for  lining  the 
stack  proper.  Where  the  inclined  flue  connecting  the  furnace  to  the  stack  can  be  built 
according  to  Figure  1,  the  fire  clay  tile  lining  is  included  in  the  price. 

LL     Muffle  is  9x15x5%  inches  outside.      QQ    Muffle  is  12^  x  19x7%  inches  outside. 
NN     Muffle  is  10%  x  19x6^  inches  outside.  UU     Muffle  is  14xl9x71/4  inches  outside. 

The  prices  are  as  follows: 

LL      Double-Muffle  Coal  or  Crude  Oil  Furnace Price  $55.00 

NN     Double-Muffle  Coal  or  Crude  Oil  Furnace "  60.00 

QQ     Double-Muffle  Coal  or  Crude  Oil  Furnace "  65.00 

UU     Double-Muffle  Coal  or  Crude  Oil  Furnace "  70.00 

NN     Single-Muffle  Coal  or  Crude  Oil   Furnace "  50.00 

QQ     Single-Muffle  Coal  or  Crude  Oil   Furnace "  55.00 

UU     Single-Muffle  Coal  or  Crude  Oil   Furnace "  60.00 

NN     Three-Muffle    Coal    Furnace "  65.00 

QQ     Three-Muffle    Coal    Furnace "  70.00 

LL      Double-Muffle    Wood    Furnace "  55.00 

NN     Double-Muffle  Wood   Furnace '  60.00 

QQ     Double-Muffle    Wood    Furnace 65.00 

UU      Double-Muffle    Wood    Furnace '  70.00 

NN     Single-Muffle   Wood    Furnace '  50.00 

QQ     Single-Muffle    Wood    Furnace '  55.00 

UU     Single-Muffle   Wood    Furnace '  60.00 

NN     Single-Muffle  Coke   Furnace '  55.00 

QQ     Single-Muffle  Coke   Furnace '  60.00 

U U     Single-Muffle  Coke  Furnace '  65.00 

Note: — The  floor  space  required  for  these  furnaces  is  approximately  three  and  a 
half  by  four  feet,  not  including  the  stack. 

We  also  manufacture     the  "Wiley"  armored  furnaces.     Write  for  particulars. 


172 


THE  DENVER  FIRE  CLAY  COMPANY. 


Fig.  6 


BULLION  OR  MELTING  FURNACES. 

Figure  6  illustrates  our  special  furnace,  using  coke  as  fuel,  made  for  refining 
bullion.  This  furnace  is  also  lined  with  special  fire  clay  tile,  each  tile  having  an  indi- 
vidual letter. 

It  is  made  in  two  sizes,  the  smaller  being  for  one  black  lead  crucible  from  No.  12 
to  20  or  smaller,  and  the  larger  being  for  one  No.  30  to  80  black  lead  crucible.  They  are 
constructed  with  the  greater  part  of  the  ash-pit  below  the  floor  level,  yet  with  the  grate 
bars  high  enough  so  that  they  can  easily  be  poked  from  the  under  side.  As  the  front 
of  these  furnaces  is  very  low  (even  the  larger  size  only  28  in.  above  the  floor),  the 
operator  can  handle  a  full  pot  easily.  The  top  of  the  furnace  is  covered  with  a  heavy 
cast-iron  frame,  to  which  the  door  is  hinged.  The  door  proper  is  the  size  of  the  inside 
of  the  furnace,  and  is  a  fire  clay  tile,  which  is  clamped  by  a  heavy  skeleton  door  frame 
in  such  a  manner  that  no  iron  work  is  exposed  on  the  inside  of  the  furnace.  By  means 
of  angle  irons  and  binding  rods  the  furnace  is  securely  bound. 

The  price  of  the  furnace  includes  the  fire  clay  tile,  and  the  iron  work  necessary 
to  erect  the  furnace;  in  fact,  everything  necessary  except  the  red  brick  jacket,  and  the 
fire  brick  for  the  stack. 


For  one  No.  12  to  20  Black  Lead  Crucible  ................................   $40.00 

For  one   No.  30  to  80  Black  Lead   Crucible..  50.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


173 


930 


Furnace  Doors.    See,  also,  Muffle  Doors,  1197. 

No. 

929  Furnace  Doors,  heavy  iron  frame  and  door  with  fire  clay  lining,  inside  meas- 
urements, 11  in.  high,  13  in.  wide.  This  door  has  lugs  on  the  frame, 
so  that  it  is  supported  and  clamped  to  place  by  the  binding  rods  of 
the  furnace,  no  anchor  bolts  being  necessary. 


Price   

Extra  Fire  Clay  Lining 


$4.50 
.50 


930  Furnace  Doors,  with  heavy  iron  frame  and  door  without  lining,  inside  meas- 
urements, 11  in.  high,  13  in.  wide.  This  door  has  four  holes  in  the 
frame  for  anchor  bolts. 

Price Net      4.00 

Note: — When  ordered  especially,  this  door  can  be  lined  with  fire  clay 
tile  lining,  the  advance  in  price  being  50  cents. 


930b 


930b     Furnace  Grate  Bars,  of  cast  iron. 

Length        12  V2       14       16 

Each 


18       20       22       24       25       27 


$0.18      .20      .28      .30      .40      .45      .50      .55      .65 


30  in. 
.70  Net 


Note: — In  estimating  numbers  required  to  cover  fire  box  sur- 
face, figure  each  complete  bar  2y2  inches  wide. 
Above  mentioned  lengths  are  carried  in  stock. 


174 


THE  DENVER  FIRE  CLAY  COMPANY. 


931 


935 


No. 

931  Furnace,  Assay,  Bosworth's.     For  coke.     Manufactured  exclusively  by  The 

Denver  Fire  Clay  Co.  Made  of  fire  clay,  in  three  sections,  for  con- 
venience in  transportation.  The  sections  are  securely  bound  with 
heavy  iron  bands.  Its  construction  is  such  that  it  is  less  liable  to 
crack  than  other  furnaces,  much  more  durable  and  convenient,  and  it 
will  do  more  work  with  less  fuel  (heating  the  muffle  quickly  and 
evenly)  than  any  other  furnace  made. 

For  9  x  15  in.  muffle,  with  one  LL  muffle   $40.00 

932  Furnace.    Same  as  above,  for  10  x  16  in.  muffle.    With  one  I  muffle 40.00 

933  Furnace.    Same  as  above,  for  8  x  14  in.  muffle.    With  one  K  muffle 35.00 


934       Furnace  Parts  for  Bosworth  Furnace. 


a. 
b. 
c. 
d. 
e. 
f. 

g- 


Extra  Doors,  iron,  for  feed  or  muffle  opening. 

Extra  Doors,    clay 

Extra  Plugs,  muffle  support 

Extra  Plugs,   poker 

Extra  Plugs,  ash  pit 

Extra  Grate  Bars,  each 

Extra  Grate  Bars,  set  of  5 


.75 
.50 
.15 
.25 
.25 
.20 
1.00 


935  Furnace,  No.  1  Assay,  "Burro."  Designed  and  manufactured  exclusively  by 
The  Denver  Fire  Clay  Company.  A  very  complete  and  satisfactory 
portable  furnace.  It  is  made  of  fire  clay,  in  one  piece,  and  securely 
bound  with  steel;  doors  asbestos  lined;  weight  100  Ibs.,  taking  muffle 
6x12x4  in. 

With  one  muffle  .  25.00 


937       Furnace,  Extra  Grate  for  No.  935 Each       1.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


938-39 


No. 

938  Furnace,  Assay,  Brown's,  made  by  The   Denver  Fire  Clay  Company,   size 

29  in.  high,  16  in.  wide  by  14  in.  deep;  supplied  regular  with  J  muffle 
4x6x12  in.,  but  can  also  be  supplied  with  G  Muffle,  4^x7x12,  if 
desired.  The  furnace  is  made  to  burn  charcoal  or  coke.  Crucible 
fusions  can  also  be  made  in  the  open  fire  on  top  of  the  muffle,  working 
through  the  feed  door  on  top,  if  necessary;  has  sectional  fire  clay 
lining  bound  entirely  with  heavy  sheet  iron.  All  doors  and  hinges 
malleable  iron  lined  with  asbestos.  This  is  an  important  feature,  as 
cast  doors  are  continually  breaking.  This  is  the  most  satisfactory 
prospecting  coke  furnace  on  the  market,  and,  where  necessary  to  carry 
on  pack  mules,  any  portion  of  the  fire  clay  lining  may  be  quickly 
removed  to  divide  the  weight. 

Weight  complete,  packed  for  shipment  with  one  muffle,  155  pounds $25.00 

939  Furnace,  Assay,  Brown's  No.  3,  same  as  above,  except  lareer;  supplied  with 

LL  Muffle  5%x9xl5 — in  size  33  in.  high,  22  in.  wide  by  19  in.  deep. 
Weight,  complete,  packed  for  shipment,  310  pounds.  This  is  an  ex- 
tremely satisfactory  furnace. 

Price  ..  35.00 


Note: — All  of  the  foregoing  Bosworth,  Burro  and  Brown  Furnaces  are  for 
coke  or  charcoal  only;  no  stove  pipe  is  included  with  any  of  them.  The 
Bosworth  Furnace  takes  6  in.  pipe;  the  Burro  and  Brown  Furnaces  take 
5  in.  pipe.  We  can  supply  extra  heavy  pipe  and  elbows,  made  of  No.  22 
iron,  in  either  5  or  6  in.,  at  50c  per  joint,  net. 


176 


THE  DENVER  FIRE  CLAY  COMPANY. 


GASOLINE  BLOW  PIPE  OUTFITS 


No. 
945 


945a 

945b 
945c 

945d 
946 
946a 
946b 


945 


Furnace  Blow  Pipe  No.  5,  D.  F.  C.  Co.,  for  gasoline,  equipped  with  a  heavy 
steel  tank  of  8  gallons  capacity;  tinned  inside  and  out  to  insure 
against  rust,  and  tested  to  a  pressure  of  200  Ibs.;  detachable  cast  iron 
base,  also  fitted  with  large  brass  hand  pump  and  pressure  gauge,  and 
supplied  with  10  feet  of  ^-inch  iron  pipe,  unions,  elbows,  etc.,  suitable 
to  operate  one,  two  or  three  burners  at  a  time.  This  blow  pipe  is 
recommended  for  all  sizes  of  gasoline  furnaces,  except  the  few 
smallest  sizes,  as  it  holds  an  all-day's  supply  of  gasoline,  and  sufficient 
air  space  to  carry  a  pressure  from  15  to  40  minutes  without  pumping, 
depending  on  the  number  and  size  of  the  burners  used;  the  best  of 
material  and  workmanship  throughout  and  thoroughly  tested. 
Shipping  weight,  75  Ibs.  Price,  without  burner $20.00 

Furnace  Blow  Pipe  No.  6,  for  gasoline.    Similar  to  945  with  15-Gallon  Tank, 
large  brass  hand  pump  and  pressure  gauge.     Supplied  with  10  ft.  of 
^-in.  iron  pipe,  unions,  elbows,  etc. 
Shipping  weight,  90  Ibs.     Price,  without  burner 30.00 

Furnace  Blow  Pipe  No.  4,  for  Gasoline.  Similar  to  945,  with  4-Gallon  Tank 
and  4  feet  of  %-in.  iron  pipe  and  pump,  but  without  pressure  gauge. 
Shipping  weight,  GO  Ibs.  Price,  without  burner 16.00 

Furnace  Blow  Pipe  No.  3,  for  gasoline.  Similar  to  945,  with  2-Gallon  Tank 
and  4  feet  of  ^-in.  iron  pipe  and  pump,  but  without  pressure  gauge. 
Shipping  weight,  50  Ibs.  Price,  without  burner 14.00 

Swivel  Joints  for  above,  extra Each  .75 

Furnace,  Extra  Pressure  gauge,  for  indicating  up  to  50  Ibs 2.00 

Furnace,  Extra  Pump,  with  stand  and  stopcock,  complete 6.00 

Furnace,  Extra  Globe  Valve   Each  .75 


THE  DENVER  FIRE  CLAY  COMPANY. 


177 


CASE  GAS,  GASOLINE  OR  CRUDE 
OIL  FURNACES 


(Patented) 


^TTTHE    principle    of    the    CASE 
•          FURNACES   is    such  that    it 
works   just  as  would  a   clean 
coke  fire,  giving  an  even  tem- 
perature throughout,  and,  in  a  muffle 
furnace,  heating  the  muffle  close  to  the 
mouth.    We  have  succeeded  in  heating  a 
J6x24   inch  muffle  evenly,  which  is 
very   much   larger   than  has  heretofore 

been  attempted* 

The  consump- 
tion of  fuel  is  com- 
paratively small, 
and  we  have  found 
that  after  once  get- 
ting the  furnace 
fairly  heated  (which 
can  be  done  very 
quickly)  the  burner 
may  be  turned 
down  low,  making  quite  a  saving  in  the  fuel. 

The  muffle  has  a  damper,  by  which  a  perfect  oxidizing  draught 
may  be  attained  in  the  muffle  when  desired  for  the  cupellation,  or  other 
oxidizing  effects,  and  closed  for  quick  heating*  As  all  operators  know 
this  is  a  most  vital  point* 

A  special  composition  of  fire  clay  is  used  in  the  manufacture  of  these 
furnaces*  This  mixture  is  a  very  poor  conductor  of  heat,  while  the 
muffles  we  manufacture  are  very  good  conductors*  Therefore  nearly 
every  one  of  the  heat  units  developed  inside  the  furnace  are  not  conducted 
away  by  the  furnace  itself,  but  are  conducted  through  the  muffle  and 
utilized  where  the  heat  is  required*  We  also  wish  to  mention  that  these 
furnaces  are  much  lighter,  as  the  composition  is  only  two-thirds  as 
heavy  as  the  regular  fire  clay  mixture* 

These  furnaces  are  now  being  used  in  every  locality  in  the  world* 
We  have  sold  a  great  number  of  them  in  the  past,  and  they  are  giving 
universal  satisfaction,  rapidly  supplanting  the  old  style  of  furnaces. 


178 


THE  DENVER  FIRE  CLAY  COMPANY. 


PATENTED  INNER  CONSTRUCTION  OF 
THE  CASE  FURNACES 

The  illustrations  given  herewith  serve  to  some  extent  to  show  the  inner  con- 
struction of  our  various  furnaces,  each  designed  for  its  particular  use  and  strictly  on 
scientific  principles.  They  have  been  examined  and  reported  upon  by  the  highest 
authorities,  and  upon  request  we  will  gladly  furnish  references  of  this  nature. 


"A"  shows  our  crucible  furnace  looking  direct- 
ly into  the  chamber,  with  one  stool  removed  to  better 
illustrate  its  design  and  also  showing  how  easily  it 
can  be  replaced  if  damaged  in  use. 

The  stepped  construction  of  these  stools  and 
the  raising  of  the  crucible  on  the  stool,  being  for  the 
purpose  of  promoting  complete  combustion  before 
contact  of  the  flame  with  the  crucible,  and  at  the 
same  time  furnishing  a  sectional  sub-bottom  to  the 
furnace  which  is  easily  and  cheaply  replaced  wholly 
or  in  part.  Stools  and  furnace  lining  are  made  of 
our  special  non-conducting  mixture  previously  de- 
scribed. 


B  BB 

"B"  shows  the  inner  construction  of  our  muffle  furnace,  looking  directly  in,  "BB" 
the  muffle  heater  in  detail,  and  "C"  the  same  furnace  in  longitudinal  section.  Here  the 
support  of  the  muffle  and  the  perfect  distribution  of  the  heat  is  provided  for  in  the 
sectional  removable  sub-bottom,  which  is  clearly  shown  in  the  latter  illustration. 

The  many  points  of  contact  given  by  these  replacable  muffle  heaters,  which  they 
are  technically  termed,  form  an  exceptionally  good  support  for  the  muffle,  while  the 
openings  between  provide  for  an  equal  distribution  of  heat  to  all  parts  of  the  muffle 
bottom. 

The  vertical  ribbed  channels  seen  in  the  inner  wall  construction  proportionally 


THE  DENVER  FIRE  CLAY  COMPANY. 


179 


increase  in  depth  toward  the  front  of  the  muffle,  which  lessens  the  resistance  to  the 
escape  of  heat  in  that  direction,  the  consequence  being  that  the  front  of  the  muffle  to 
within  y2  inch  of  the  door,  is  heated  as  perfectly  as  any  other  portion. 


RIBS    FOR  GUIDING   HEAT  CURRENTS 


I  1^^ :  ' 


The  sectional  view  also  clearly  shows  the  position  of  the  dampers  which  govern 
the  heat  conditions  in  the  muffle,  allowing  for  an  oxidizing  effect  to  cupel  or  scorify, 
or  closed,  reducing  condition  for  quick  heating  or  fusions. 

The  whole  construction  is  one  of  our  patented  designs  and  its  efficiency  in  perfect 
utilization  and  small  requirement  of  fuel  is  really  phenomenal. 


D 

In  figure  "D"  we  illustrate  the  special  features  used  in  the  construction  of  our 
combination  crucible  and  muffle  furnace.  It  differs  in  the  combining  of  the  two  furnaces 
previously  described,  only  in  the  design  of  the  crucible  stools  shown  at  the  back  and 
in  detail  in  figure  "E."  These  have  been  designed  to  admit  of  less  resistance  to  the 
passage  of  heat  to  the  muffle  in  the  front  of  the  furnace  and  especially  to  prevent 
contact  of  the  flame  with  the  crucible  before  complete  combustion  has  taken  place, 
thereby  practically  doing  away  with  the  detrimental  effects  of  incomplete  combustion 
gases  on  clay  crucibles  so  well  known  to  operators  of  open  fire  fusion  furnaces. 

The  crucible  stools  and  muffle  heaters  are  made  in  small  sections,  as  in  other 
types  described,  to  permit  of  their  being  easily  and  cheaply  replaced,  and  all  the  good 
points  of  preceding  furnaces  are  here  retained.  The  combination  is  a  splendid  type  of 
scientific  furnace  construction  and  is  fully  covered  by  patent  rights. 

On  the  following  pages  we  give  an  itemized  description  of  capacity,  burner  re- 
quired, weight,  etc.,  of  our  entire  line  of  furnaces.  Inquiries  regarding  anything  of  a 
furnace  nature,  or  other  metallurgical  clay  goods,  will  be  given  our  most  careful  atten- 
tion and  answered  in  the  fullest  detail. 

We  make  furnaces  for  all  purposes,  such  as  drill  sharpening,  annealing  and  tem- 
pering and  enameling.  Write  us  your  special  requirements. 


THE  DENVER  FIRE  CLAY  COMPANY. 


IMPROVED  CASE  CRUCIBLE  FURNACES 


For  Gas,  Gasoline  and  Crude  Oil. 
Patented. 


Code  Word,  "Cacru." 


No. 

954       Improved  Case  Crucible  Furnace  No.  5.    Capacity,  6  "J"  Crucibles. 

Net  weight,  150  Ibs.;  gross  weight,  210  Ibs $40.00 

Requires  2-inch  Case  Burner  or  equivalent. 

Improved   Case   Crucible    Furnace    No.   6.     Capacity,   8  "F"   or  20   gramme 
crucibles. 

Net  weight,  120  Ibs. ;  gross  weight,  150  Ibs 40.00 

Requires  1%-inch  Case  Burner  or  equivalent. 

Improved   Case  Crucible   Furnace   No.  7.     Capacity,   12  "F"  or  20  gramme 
crucibles. 

Net  weight,  160  Ibs. ;  gross  weight,  215  Ibs 42.00 

Requires  2-inch  Case  Burner  or  equivalent. 

Improved   Case  Crucible   Furnace   No.  8.     Capacity,   16  "F"  or  20   gramme 
crucibles. 

Net  weight,  200  Ibs.;  gross  weight,  240  Ibs 45.00 

Requires  2^4-inch  Case  Burner  or  equivalent. 

Prices  include  Furnace  and  Iron  Stand. 


THE  DENVER  FIRE  CLAY  COMPANY. 


181 


IMPROVED  CASE  MUFFLE  FURNACES 


For  Gas,  Gasoline  and  Crude  Oil. 
Patented. 


No. 
956 


956 
Code  Word,  "Camuf." 

Improved  Case  Prospector's  Furnace   No.  11.     Size  muffle,  6   in.  x  &/2   in.; 
capacity,  4-10  gramme  crucibles. 

Net  weight,  39  Ibs.;  gross  weight,  50  Ibs. 

Exterior  dimensions:     Width,  10  inches;  height,  10  inches;  length,  9 

inches.     This  little  furnace  will  be  found  very  convenient  where  it 

is  necessary  to  reduce  bulk  and  weight  to  the  minimum.    Price  with- 
out Iron  Stand $1 5.00 

Requires  Case  Midget  Burner  or  equivalent. 
Improved  Case  Muffle  Furnace  No.  12.    Size  Muffle,  6  in.  x  10  in. 

Net  weight,  160  Ibs.;  gross  weight,  190  Ibs 40.00 

Requires  Case  Midget  Burner  or  equivalent. 
Improved  Case  Muffle  Furnace  No.  13.    Size  muffle,  8  in.  x  12  in. 

Net  weight,  210  Ibs.;  gross  weight,  260  Ibs 55.00 

Requires  1%-inch  Case  Burner  or  equivalent. 
Improved  Case  Muffle  Furnace  No.  14.     Size  muffle,  10  in.  x  16  in. 

Net  weight,  290  Ibs.;  gross  weight,  350  Ibs 60.00 

Requires  2-inch  Case  Burner  or  equivalent. 
Improved- Case  Muffle  Furnace  No.  15.    Size  muffle,  14  in.  x  18  in. 

Net  weight,  400  Ibs.;  gross  weight,  450  Ibs .' 80.00 

Requires  21/4-inch  Case  Burner  or  equivalent. 
Note: — Our  muffles  for  the  Case  Furnaces,  owing  to  their  shape,  have  a 

much  greater  capacity  than  ordinary  muffles  of  the  same  dimensions. 

Prices  include  Furnace  and  Iron  Stand. 


182 


THE  DENVER  FIRE  CLAY  COMPANY. 


The  Most  Scientifically  Constructed  Furnace  on  the  Market 


THE  DENVER  FIRE  CLAY  COMPANY. 


183 


IMPROVED  CASE  GAS  MUFFLE  FURNACES 


Patented. 


Code  Word, 
"Cagas." 


In  this  Muffle  Furnace  we  have  combined  all  features  most  desired  by  practical 
assayers  and  metallurgists. 

It  uses  a  10x16  in.  muffle  with  high  sides,  which  will  hold  15  20-gramme  cruci- 
bles, or  any  other  Case  Furnace  regardless  of  size  or  style. 

It  can  be  started  from  cold,  and  be  ready  for  work  in  thirty  minutes,  and  will 
easily  maintain  a  temperature  of  2500  degrees  Fahrenheit  on  a  gas  consumption  of  90  ft. 
per  hour  or  less,  and  may  be  operated  on  any  kind  of  gas.  Actual  cost  of  operation  as 
demonstrated  on  $1.00  gas  about  ll/2  to  8  cents  per  hour. 

The  perfectly  even  heat  obtained  in  all  parts  of  the  muffle  enables  one  to  "feather" 
cupels  and  secure  the  desired  uniform  results. 

All  parts  of  the  muffle  can  be  supplied  with  air  by  means  of  a  damper  and  perfect 
oxidation  secured,  while  cupellation  is  rapid  and  complete. 

It  is  well  ventilated,  and  the  flue  is  under  perfect  control,  carrying  off  all  fumes 
or  odors. 

The  entire  furnace  lining  is  made  of  the  best  fire  clay  in  two  pieces,  and  is 
enclosed  in  a  substantial  sheet  iron  jacket.  The  muffle  may  be  removed  and  replaced 
without  disturbing  any  other  parts. 

The  furnace  is  mounted  at  an  easy  working  height,  on  a  substantial  stand,  to 
which  the  blower  and  motor  are  attached,  making  a  complete,  self-contained  outfit, 
which  occupies  but  little  space,  can  be  set  up  in  any  convenient  place,  and  is  easily 
portable. 

The  electric  motor  can  be  furnished  for  any  lighting  circuit,  and  requires  about 
the  same  current  as  a  16  C.  P.  lamp. 

We  believe  this  is  the  best  combination  yet  offered  to  assayers  and  chemists,  - 
and  is  a  very  desirable  appliance  for  any  shop  or  laboratory. 

Height,  54  inches.    Weight,  500  Ibs.     Floor  space,  24x28  in. 

Price,  packed  for  shipment,  from  $100.00  to  $150.00,  depending  on  furnace  selected. 


184 


THE  DENVER  FIRE  CLAY  COMPANY. 


ELECTRIC  FAN  BLOWER 


957 

This  direct  connected  and  self-contained  soft  blast  Improved  Blower  meets  the 
wants  of  many  small  manufacturers  who  require  a  moderate  blast  of  steady,  uniform 
pressure,  that  is  always  available  at  slight  expense. 

It  may  be  connected  to  an  ordinary  lamp  socket,  as  it  runs  on  any  light  or 
power  circuit,  and  at  a  cost  of  less  than  one  cent  per  hour. 

The  fan  blades  are  12  inches  in  diameter,  the  blast  pipe  is  2  inches  in  diameter, 
and  it  delivers  2,000  cubic  feet  of  air  an  hour,  at  15-10  inch  pressure. 

It  has  a  strong  cast  iron  frame,  which  may  be  set  either  vertically  or  horizontally, 
as  the  legs  are  adapted  to  any  of  four  positions. 

The  motor  is  well  enclosed  and  protected  from  dust  or  other  injury,  has  self- 
oiling  bearings,  is  very  durable,  and  requires  practically  no  attention. 

A  blast  gate  should  be  used  to  control  the  air,  and  when  this  is  closed  very 
little  electric  current  is  required. 

In  ordering,  state  voltage;  whether  direct  or  alternating  current  and  cycles. 

BURNER. 

Case  Patent  Soft  Blast  Burner,  which  burns  any  city  gas  or  natural  gas.  The 
only  Burner  operated  with  a  soft  blast  that  is  an  absolute  success,  the  gas  supply 
being  regulated  by  a  large  cock  with  graduated  dial. 

IMPROVED  CASE  FURNACE  OPERATED  BY  GAS 

We  wish  to  advise  we  mount  all  kinds  and  sizes  of  Case  Furnaces  on  stands  of 
this  character  and  also  burners  and  blowers  of  every  size  to  suit. 

In  the  event  you  are  interested  in  Gas  Furnaces,  it  will  undoubtedly  pay  to  get  our 
prices,  on  any  equipment  you  may  select,  before  buying.  We  also  manufacture  Furnaces 
for  annealing  and  tempering. 


THE  DENVER  FIRE  CLAY  COMPANY. 


185 


IMPROVED 
CASE  COMBINATION  FURNACES 


(For  Gas,  Gasoline  and  Crude  Oil.) 
Patented. 


Code  Word,  "Cacomb." 
No. 

958       The  Improved  Case  Combination  Furnace  No.  30.     Size  muffle,  6  in.  x  8  in. 
Capacity  2  "G"  or  20  gramme  crucibles. 

Net  weight,  190  Ibs.;  gross  weight,  225  Ibs $45.00 

Requires  Case  Midget  Burner  or  equivalent. 

The  Improved  Case  Combination  Furnace  No.  31.    Size  muffle,  6  in.xS  in. 
Capacity  4  "G"  or  20  gramme  crucibles. 

Net  weight,  210  Ibs.;  gross  weight,  250  Ibs 50.00 

Requires  1%-inch  Case  Burner  or  equivalent. 

The  Improved  Case  Combination  Furnace  No.  32.     Size  muffle,  6  in.  x8  in. 
Capacity  8  "F"  or  20  gramme  crucibles. 

Net  weight,  225  Ibs.;  gross  weight,  280  Ibs 55.00 

Requires  2-inch  Case  Burner  or  equivalent. 
Prices  include  Furnace  and  Iron  Stand. 


186  THE  DENVER  FIRE  CLAY  COMPANY. 


CASE  MELTING  FURNACE 


970  974 

The  flame  blow-in  is  located  so  that  the  flame  blows  in  on  a  tangent  and  does  not 
hit  the  crucible  until  there  is  complete  combustion.  The  hot  gases  circle  around  the 
crucible,  thereby  preventing  the  loss  of  crucible  by  cracking,  and  saving  the  wear  and 
tear  on  same  to  such  an  extent  that  you  are  able  to  get  from  three  to  four  extra  melts 
out  of  each  crucible.  This  Furnace  practically  divides  in  the  center,  so  when  the  cover 
is  lifted  off  it  leaves  the  upper  portion  of  the  crucible  so  exposed  that  one  can  lift  same 
out  by  tongs,  which  renders  it  less  liable  to  the  strain  caused  by  the  usual  method  of 
lifting. 

No. 

970       Case  Melting  Furnace  No.  1  (gas  only)  complete  $     4.00 

Taking  No.  1  black  lead,  small  nest  Hessian  sand  or  Denver  Fire  Clay  Com- 
pany's crucibles  up  to  20  gramme.  Net  weight,  7  Ibs.;  shipping  weight, 
10  Ibs. 

Parts: — Furnace  body .75 

Furnace  body  and  cover 1.10 

Burner   alone , 1 .50 

Stand,  without  burner 90 

970a     Case  Melting  Furnace  No.  2  (gas  only),  complete  5.00 

Taking  No.  3  black  lead,  or  large  nest  Hessian  sand  or  Denver  Fire  Clay 
Company's  crucibles  up  to  G.  Net  weight,  20  Ibs.;  shipping  weight, 
27  Ibs. 

Parts: — Furnace  body    3.25 

Furnace  body  and  cover 4.00 

Burner  alone   1 .50 

970b     Case  Melting  Furnace  No.  3,  without  burner  8.00 

Requires  Midget  Burner. 

Taking  No.  7  black  lead   crucibles.     Net  weight,   40   Ibs.;    shipping 
weight,  50  Ibs. 

Parts: — Furnace  body 7.00 

Furnace  body  and  cover   8.00 

Midget  Burner  alone  6.00 

970c     Case  Melting  Furnace  No.  4,  without  burner 12.00 

Taking  No.  16  black  lead  crucibles.     Net  weight,  100  Ibs.;    shipping 
weight,  130  Ibs.    Requires  Midget  burner. 

974  Furnace,  Erdmann's.    Of  fire  clay  for  gas;  complete,  with  burner  and  tripod.       1.00 

975  Furnace,  Erdmann's.    Fire  clay  cylinders,  alone .25 


THE  DENVER  FIRE  CLAY  COMPANY. 


187 


Improved  Case 
Melting  Furnaces 

(For  gas,  gasoline  and  crude  oil.) 
Patented. 


The  flame  blow-in  is  located  so 
that  the  flame  enters  the  furnace 
on  a  tangent  and  does  not  hit  the 
crucible  until  there  is  complete 
combustion.  The  hot  gases  circle 
around  the  crucible,  thereby  pre- 
venting the  loss  of  crucibles  by 
cracking,  and  saving  their  wear  and 
tear  to  such  an  extent  that  their 
life  is  lengthened  several  melts, 
this  furnace  is  made  in  three  sec- 
tions, or  practically  divides  in  the 
center,  so  when  the  upper  ring  is 
lifted  off  it  leaves  the  upper  portion 
of  the  crucible  so  exposed  that  it 
can  be  removed  with  basket  tongs. 

The  illustrations  show  the  Fur- 
nace ready  for  bullion  melting  and 
also  as  used  for  retorting  amalgam, 
using  a  special  fire  clay  ring 
in  which  the  Nevada  style  of 
retort  fits.    It  is  the  most  effi- 
cient and  convenient  Furnace 
for  retorting  and  melting  bul- 
lion yet  devised,  and  Indispen- 


sable to  amalgamation  mills.  Fitted  with  gas  or  oil  burners 
if  desired. 


Code  Word, 
"Cabu." 


980 


188 


THE  DENVER  FIRE  CLAY  COMPANY. 


Case  Patented  Furnaces 


Case  Bullion  Furnace  fitted  with  Case  Patent  Gas  Burner,  and  Improved  Soft  Blast 
Blower,  showing  how  crucible  is  exposed  for  easy  lifting  by  removal  of  ring  immediately 
beneath  cover. 

Pitted  with  gasoline  or  oil  burners  if  desired. 


THE  DENVER  FIRE  CLAY  COMPANY. 


189 


Case  Patented  Furnaces 


Illustrating  Muffle  and  Bullion  furnaces  with  Case  Patent  Gas  Burners,  both  con- 
nected to  one  Blower. 

We  furnish  Blowers  for  operating  any  number  of  burners  up  to  ten  in  one  battery, 
in  which  one  or  more  can  be  isolated  at  any  time  if  desired. 


190  THE  DENVER  FIRE  CLAY  COMPANY. 

IMPROVED 
CASE  MELTING  FURNACES 

(For  Gas,  Gasoline  and  Crude  Oil.) 
Patented. 

Code  Word,  "Cabu." 

No. 

980       Bullion  Furnace,  No.  20.    Holds  black  lead  crucible  No.  7. 

Crucible  compartment,  Weight,  packed  for  shipment 

Diameter,  6  inches;  depth,  9  inches.  150  pounds Price  $32.00 

Requires  Case  Midget  Burner. 

980       Bullion    Furnace,  No.  22.    Holds  black  lead  crucible  No.  25. 

Crucible  compartment,  Weight,  packed  for  shipment 

Diameter,  10  inches;  depth,  13%  inches.  230  pounds Price     38.00 

Requires  2-inch  Case  Burner. 

980       Bullion  Furnace,  No.  23.     Holds  black  lead  crucible  No.  45. 

Crucible  compartment,  Weight,  packed  for  shipment 

Diameter,  13  inches;  depth,  17  inches.  420  pounds Price    45.00 

Requires  Case  Burner,  2%  inches. 

980       Bullion  Furnace,  No.  24.     Holds  black  lead  crucible  No.  80. 

Crucible  compartment,  Weight,  packed  for  shipment 

Diameter,  18  inches;  depth,  19%  inches.  750  pounds Price     60.00 

Requires  two  Case  Burners,  2%  inches. 

980       Bullion  Furnace.    Holds  black  lead  crucible  No.  100. 

Requires  two  Case  Burners,  size  2%  inches.      Net  weight,  750  Ibs.;   packed 

for  shipment,  980  pounds..     80.00 
Prices  include  Furnace  and  Iron  Stand. 


980a 


980b 
980a     Stool  on  which  crucible  rests  in  furnace  $0.50 

980b  Bullion  Mixer,  of  clay,  in  use  at  U.  S.  mints  for  perfectly  mixing  bullion 
immediately  before  pouring.  Bars  are  much  more  homogeneous,  giving 
better  samples  for  assay  2.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


191 


STEELE-HARVEY  TILTING  FURNACE 


Pouring  Position 


981a 


Component  Parts 


In   Melting   Position 
CRUCIBLE   TILTING   FURNACES— STEELE-HARVEY. 

Furnaces,  especially  adapted  to  the  use  of  melting  and  refining  metals,  cyanide 
precipitates,  etc.  Burns  crude  oil  or  distillate;  clean,  easily  operated,  economical. 
Crucible  remains  constantly  in  furnace,  which  means  a  saving  of  40%  in  the  life  of 
each  crucible.  Takes  regular  shaped  Dixon  Crucible  as  follows: 

Shipping  weight.  Furnace  No.  Size  of  crucible.  Floor  space  required. 


1700  Lbs 40 

1800     "     60 

2000     "     125 

2900     "     275 

450 


40 
60 
125 
300 
Special  size,  very  large. 


4'7"  x  3'3" 
4'9"  X  3'3" 
5'  X  3'6" 
5'3"  3'6" 


If  interested,  write  for  special  Catalogue  and  further  information. 


192 


THE  DENVER  FIRE  CLAY  COMPANY. 


CASE  HYDRO-CARBON  BURNER 


Patent  Pending. 


982 
Code  Word,  "Caburn.' 


We  have  recently  perfected  a  burner  for  high  grade  distillates  in  the  construction 
of  which  we  have  been  able  to  eliminate  all  the  unsatisfactory  features  of  the  earlier 
types  of  burners.  For  six  months  prior  to  putting  it  on  the  market  we  have  been  testing 
it  out  under  all  possible  conditions,  until  we  are  now  prepared  to  say  nothing  approaches 
it  for  small  fuel  consumption,  absence  of  possible  leaky  plugs,  no  "back-firing,"  and 
absolute  reliability  under  varied  conditions  has  ever  been  devised.  Among  the  ad- 
vantages of  its  improved  construction  we  may  mention: 

COMPACTNESS. 

By  an  original  design  apparent  from  the  above  illustration  we  have  been  able 
to  shorten  the  length  fully  one-half  from  that  of  any  other  make  of  similar  capacity. 
This  is  accomplished  by  constructing  the  mixing  chamber  a  truncated  cone  with  the 
flare  toward  the  valve,  enabling  a  sufficient  supply  of  air  to  become  thoroughly  mixed 
with  the  vaporized  gasoline  in  a  very  short  distance.  The  Case  burner  weighs  but 
two-thirds  as  much  as  other  makes  of  similar  size. 


THE  DENVER  FIRE  CLAY  COMPANY.  193 


VALVE. 

All  burners  heretofore  have  been  constructed  with  a  "Needle"  valve,  which  is 
constantly  wearing  a  larger  orifice,  appreciably  shortening  the  life  of  the  burner,  as 
this  opening  can  never  again  be  reduced.  We  have  entirely  disregarded  all  other  valve 
constructions  and  have  succeeded  in  producing  a  non-leakablo,  non-wearing  valve. 

The  complete  closing  of  the  valve,  is  accomplished  by  the  meeting  of  the  shoulder 
on  the  valve  stem  and  the  seat,  which  are  planed  surfaces,  to  make  a  perfect  juncture, 
and  no  matter  how  tightly  the  valve  stem  is  screwed  up  no  damage  to  the  opening 
through  which  the  gas  or  gasoline  is  forced  can  result. 

The  regulation  of  the  flow  is  accomplished  by  constructing  in  the  channel  between 
the  valve  seat  and  the  opening  through  which  the  gas  is  emitted,  of  a  groove  whose 
cross-section  increases  proportionately  as  the  valve  is  opened.  The  groove  is  so  con- 
structed that  the  gas  on  passing  through  it  is  reflected  from  the  upper  surface  of  this 
channel,  this  surface  being  exactly  perpendicular  to  the  plane  of  the  front  of  the  burner 
and  perfectly  centering  the  opening  into  the  furnace,  forcing  the  flow  of  gas  directly 
through  the  center  of  the  burner. 

In  comparing  the  illustration  of  this  burner  with  those  of  other  manufacturers 
attention  is  respectfully  called  to  the  few  joints  in  its  construction,  minimizing  the 
possibility  of  leaks,  which  are  always  such  an  annoying  feature  to  the  operator. 

In  fuel  consumption  the  Case  burner  of  equal  size  requires  but  three-fourths  as 
much  as  any  other  burner  on  the  market  to  produce  the  same  number  of  heat  units. 
In  conclusion,  we  have  withheld  the  introduction  of  our  burner  until  all  possible  elim- 
inations of  the  difficulties  previously  experienced  in  the  operation  of  Hydro-Carbon 
burners  could  be  accomplished.  How  well  we  have  succeeded  will  at  once  be  apparent 
upon  a  trial  of  this  burner. 

BURNERS,  CASE  HYDRO-CARBON. 

Dia.     1%    1%     2     2%    2V2  in. 


Each      $10.00      11.00      12.00      13.50      15.00 


194  THE  DENVER  FIRE  CLAY  COMPANY. 


BURNERS 


Code  Word,  "Midget." 


No. 

983       Burners,   Case   "Midget."     This   burner  is   undoubtedly  the  most  efficient, 
small,  low-priced  burner  on  the  market. 

We  would  call  your  attention  to  its  compactness  and  to  the 
generating  valve,  and  would  mention  that  it  has  a  generating  pan 
(for  starting  burner),  which  is  not  generally  given  as  part  of 
burner  at  this  price.  Burner  complete  $6.00 


984 
984       Burners,  "Gary,"  Hydro-Carbon. 

Dia.        1%        1V2         1%          2          2%  in. 


Each    $10.00      11.00      12.00      13.50      15.00  Net. 


985  Oil  Burner,  Billow.  Can  be  used  with  equal  effect  with  steam,  air  from  high- 
pressure  compressor,  or  low-pressure  positive  blast  blower. 
Atomizes  oil  economically  and  with  perfect  regulation.  Will  not 
choke  or  clog  or  admit  of  wasteful  use  of  steam,  air  or  oil.  Espe- 
cially adapted  to  use  with  Case  and  tile  lined  muffle  Furnaces. 

Price    .  .   $25.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


195 


CASE  GAS  BURNERS 

Patented. 


No. 

987 


987 
Code  Word,  "Cagab." 


Case  Patented  Soft  Blast  Gas  Burners.  The  only  burner  designed  to  burn 
gas  with  a  soft  or  positive  blast  blower.  Burner  fitted  with  pilot  light 
and  dial  cock  for  gas,  and  butterfly  valve  for  air. 

Price .  $15.00 


196 


THE  DENVER  FIRE  CLAY  COMPANY, 


GASES 


993  and   994 


No. 
990 

991 

992 

993 

994 


Ammonia  Gas,  Anhydrous  Ammonia,  liquefied  in  50  and  100-lb.  cylinders  lb.$  0.50 
Cylinders    Each    25.00 

Carbonic  Acid,  liquefied,  in  18-lb.  cylinders lb        .25 

Cylinders    Each     10.00 

Chlorine  Gas,  liquefied,  in  cylinders  of  125  Its lb         .50 

Cylinders    Each    45.00 


Hydrogen  Gas,  compressed,  under  225  Ibs.  pressure Cubic  foot 

Oxygen  Gas,  compressed,  under  225  Ibs.  pressure Cubic  foot 

Cylinders  for  993   and  994,  tested  to   600  Ibs.  and  guaranteed  with 
double  needle  valve. 

Capacity          15        25        35        40        50  Cubic  feet. 


.05 
.20 


Each 


$20.00    22.00    24.00    26.00    30.00 


995       Oxygen  Gas,  pure,  compressed,  in  small  cylinders,  as  used  in  Mahler's  Cal- 
orimeter,   etc Gallon 


.10 


Cylinders,  of  100  gallons  capacity,  filled  20.00 

Yoke  connection  for  cylinder  1-25 


THE  DENVER  FIRE  CLAY  COMPANY. 


197 


GLASS  BLOWING  DEPARTMENT 


A  CORNER  OF  THE  GLASS   BLOWING   DEPARTMENT  OF  THE   DENVER   FIRE 

CLAY   COMPANY. 

Our  department  for  the  manufacture  and  repair  of  glass  apparatus  is  the  most 
completely  equipped  in  the  West  and  there  is  no  phase  of  this  work  that  we  are  not 
fully  prepared  to  handle. 

We  manufacture  and  carry  in  stock  a  very  large  line  of  thermometers  and  hydro- 
meters and  can  supply  anything  of  a  special  nature  that  might  be  required,  upon  re- 
ceipt of  sketch  or  specification. 

All  metal  case  thermometers  of  ours  or  other  make  can  be  repaired  by  sending 
the  broken  thermometer  to  us,  and  all  damaged  or  broken  glass  apparatus,  regardless  of 
its  nature  or  use,  can  be  repaired  by  this  department  at  a  reasonable  cost. 

The  material  we  use  in  making  new  apparatus  or  in  repair  work  is  the  very 
best  German  Glass  imported  by  us  direct  and  our  workmen  are  the  most  skilled  we 
are  able  to  secure. 

Those  who,  heretofore,  have  found  it  necessary  to  send  farther  East  or  to  Eu- 
rope for  special  articles  of  glass  will  find  this  department  at  once  a  time  and  money 
saver — our  quality  of  goods  and  workmanship  cannot  be  excelled  and  our  advantageous 
location  must  appeal  to  anyone  to  whom  time  is  an  object  either  in  repairing  apparatus 
in  constant  use  or  making  up  something  new,  which  may  be  immediately  required. 

Many  Universities,  Schools  and  Custom  Analytical  Laboratories  have  damaged 
or  broken  apparatus  which  are  of  no  use  to  them  in  that  condition  and  unavailable  for 
the  purpose  for  which  they  were  purchased.  We  beg  to  call  their  attention  to  the  fact 
that  very  frequently  these  can  be  expressed  to  us  with  safety,  repaired  and  returned 
at  a  saving  of  from  50  to  75%  of  cost  of  replacing  with  new  apparatus. 

Send  in  your  Burettes  for  repairs. 


198 


THE  DENVER  FIRE  CLAY  COMPANY. 


GLASS  TUBING 


1001 

Best  German,  lead  free,  made  expressly  for  chemical  use,  for  glass  blowing  and  fitting 
up  chemical  apparatus,  being  strong  and  elastic.  In  lengths  of  5  ft. 

No. 

1001     Glass  Tubing,  medium  wall. 

Size  from    3  to  20  mm.  external  dia Ib    $0.50 

Size  from  21  to  50  mm.  external  dia Ib         .60 

Size  from  51  to  65  mm.  external  dia.   .  .    Ib         .75 


1002 


1002     Glass  Tubing,  light  wall.  Same  prices  as  No.  1001. 


33. 


34.         35. 

1003 


36. 


1003  Glass  Tubing,  barometer.    From  7  to  10  mm.  external  dia Ib.  .75 

1004  Glass  Tubing,  capillary.    From  2.5  to  5  mm.  external  dia Ib.  1.00 

1005  Glass  Tubing,  combustion.     Hard  Jena  glass  Ib.  .75 

1006  Glass  Tubing,  combustion.     Small  sizes  for  blowpiping  and  Marsh's  arsenic 

test    .                                                                                                                Ib  1.00 


1007 


1007  Glass  Tubing,  gauge.    Well  annealed,  from  6  to  20  mm.  external  dia. 

1008  Glass  Tubing,  gauge.    Cut  in  any  length  to  order  


..  Ib. 
.  Ib. 


.75 
1.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


199 


lOlla 


No. 

1011     Glass  Beads,  solid.    For  surface-extending  medium  in  absorptions Ib.    $1.20 

lOlla  Glass  Cutter,  for  tubing,  Griffin's,  made  of  nickel-plated  brass Each       1.00 

Extra  steel  wheels 20 

lOllb  Glass  Cutter,  rotary,  for  cutting  large  circles.  Cutter  disc  at  end  of  grad- 
uated arm  contains  6  wheels.  Mounted  on  brass  base  with  rubber 
bearing  on  under  side  Price  3.00 


1012 

1012  Glass  Cutter,  for  tubing.    Will  cut  any  length  up  to  10  in $  1.25 

1012a  Glass  Cutter,  steel  wheel,  for  plates  

1013  Glass  Plates,  square.    Light,  ground  on  one  side. 

Size  234568 


.25 


10      12  in.  sq. 


Each    $0.03      .04      .05      .07      .10      .15      .25      .30 
1014     Glass  Plates,  square.     Heavy,  plate  glass,  ground  on  one  side. 

Size  3         4         5         6         8       10       12       15       20  in.  sq. 


Each    $0.10      .15      .20      .25      .40      .60    1.00    1.50   2.50 

1015  Glass  Plates,  square,  blue  colored  glass. 

Size  2x2        3x3        4x4        5x5         6x6  in. 

Each         $0.05        .06          .08          .12         .15 

1016  Glass  Powder   .......................................................    Ib.         .10 

1017  Glass  Rods.   Lead  free  glass,  in  5-feet  length.    Give  dia.  in  ordering  ...  Ib.        .50 

1018  Glass  Stirrers.    Ends  rounded,  lead  free  glass. 


Length 
Dia. 


5 
3-16 


8      10 


12       18  in. 
5-16     y2  in. 


Ib.          $1.00    1.00      .75      .75      .60      .60      .60 
Doz.  .25      .30      .40      .60      .80    1.00    2.00 


1019     Glass  Wool.    Of  Bohemian  glass,  finest,  for  filtration  ........  oz.  $0.60;   Ib.      8.00 


200 


THE  DENVER  FIRE  CLAY  COMPANY. 


1021 
No. 

1020 
1021 


1022 


1023 


1024a 


Gloves,  Asbestos,  with  thumb  and  finger   Pair    $3.50 

Gloves,    Asbestos,    M  ittens    Pair      2.75 


1022     Gloves,  Black  Rubber.     Acid  proof.     For  protecting  the  hands  in  handling 
acids,  nitrate  of  silver,  etc. 

Size  Short        Half  Long     Short    Half  Long    H'vy  Driving 

No.  10  to  12         10  to  12  13  13  13 

Gauntlet     none  4  in  none          4  in.  5  in. 


Pair 
1023     Gloves,  White   Rubber. 


$1.25  1.50  1.40  1.65  2.00 

For  smelters,  in  use  in  chlorination  and  cyanide 

works,  etc.     No.  13,  with  9-in.  gauntlet    Net     $3.50 

1023a  Gloves,  White  Rubber.     No.  13,  21-in.  gauntlet  Net      6.00 

1024  Goggles,  for  protecting  the  eyes,  colored  glass  Pair        .15 

1024a  Goggles,  Covers',  made  of  a  single  piece  of  pure  rubber;  fit  anybody;   air 

tight    .' Price       1.50 

1025  Gold   Pans,   Miners'  "New  Hit,"  Patented,  16%  in.  x2%   in.     A  great  time 

saver,  and  of  especial  value  to  the  inexperienced  miner 2.00 


1031 


1032 


.50 


1031  Gold  Pans,  Miners'  polished  steel,  16  in.  dia.,  2%  in.  deep 

1032  Gold  Pans,  Miners',  polished  steel,  with  copper  bottom.     16  in.  dia.,  2%  in. 

deep    • 3.00 

1032a  Gold  Pans,  Miners',  all  copper.     16  in.  dia.,  2%  in.  deep   2.50 


1033  1034-5  1035a 

1033  Gold  Pans,  Miners',  agate  or  graniteware.     16  in.  dia.,  2%  in.  deep $1.25 

1034  Gold  Pans,  Miners',  aluminum.     15  in.  dia.,  2%  in.  deep   2.00 

1035  Gold  Pans,  Miners',  aluminum.     12  in.  dia.,  2  in.  deep  1.50 

1035a  Gold   Pans,   Richard's,  Vanning   Plaque,  of  enameled   iron    1.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


201 


1036-40 

No. 

1036  Gold  Washing  Horns,  miners'.     Of  plain  horn,  unpolished,  best  quality $0.75 

1037  Gold  Washing  Horns.     Of  black  polished  buffalo  horn    1.00 

1038  Gold  Washing  Horns.     Of  hard   rubber,   black    75 

1039  Gold  Washing  Horns.     Of   copper    1.00 

1040  Gold  Washing  Horns.     Of  steel,  polished   .40 


1042 


1042a 


1044a 


1041  Graduates,  glass,  cone  shape.  Guaranteed  accurate. 

Capacity  1  dram  2  drams 

Capacity        60  minims     120  minims 
Each  $0.25  .30 

1042  Graduates,  glass,  graduation   in  ounces. 

Capacity          V2         1        2         4        8       16       32  oz. 


Each 


$0.15      .18      .20      .25      .35      .60      .90 


1042a  Graduates,  glass,  conical   graduation   in  grammes. 

Capacity  25       50     100     150     200     250     500  1000  gms. 

Each  ~        $0.35      AO      150      [60 ^70      .80    1.00    1.80 

1043     Graduates,  glass,  double  graduation,  in  grammes  and  ounces. 
Capacity          1        2        4        8       16       32  oz. 
Capacity        30       60     125     250     500  1000  grms. 
Each          $0.30      .40 160 .80    1.20   2.00 

1044a  Graduates,  glass.     Beaker  form,  flat  bottom,  without  foot,  lessening  the  lia- 
bility of  breakage. 

Capacity          1        24        8       16       32  oz. 
Each          $0.20      !25 [30 ^35 .50    1.00 


202 


THE  DENVER  FIRE  CLAY  COMPANY. 


HAMMERS 


1047 


1049 


1045 


1050 


No. 
1045 

1046 


1047 


1048 

1048a 

1049 


1050 


Hammers,  blow  pipe,  Plattner's.     Nickel-plated,  with  wire  handle   $0.60 

Hammers,  slagging.    Of  superior  "Hammond"  cast  steel. 

Weight        8  oz.        13  oz.        1  Ib.        1  Ib.  3  oz.        1  tt>.  7  oz. 

Each 


$0.50 


.55 


.60 


.65 


.75 


Hammers,   Donaldson's.     Same  as  No.  1046,  for  cleaning  slag  anvil,  with 
brush  2%  x  %  inch,  attached  to  one  side  of  pole  by  screws. 


lib. 


Weight 

Each          $1.25 


lib.  3  oz.         2  Ibs.  2  oz. 


1.50  1.75 

Hammers,   Extra   Brushes,  for  above .50 

Hammers,  Striking.     For  breaking  up  large  samples,  double  pole Each       1.00 

Hammers,  ball  pein.    Best  cast  steel. 

Weight        12  oz.        lib. 

Each  $0.75          1.00 

Hammers,  Prospecting  Picks. 

Pick  length      7  8  in. 

Each  $1.25 


1.40 


THE  DENVER  FIRE  CLAY  COMPANY. 


203 


HOT  PLATES 

FOR  GAS 


1050a 


No. 

1050a  Hot  Plate.    For  use  with  gas,  giving  even  temperature  to  all  parts  of  the 
plate. 

Size  18x14        18x22        18x30  in. 


Each          $10.00          15.00          20.00 
1050aa  Hot  Plate,  as  above,  for  use  with  gasoline  gas. 
Size  10x18        14x18        18x25 


Each 


$9.00 


12.50 


20.00 


18x36  in. 


30.00 


ELECTRIC  LABORATORY  PLATES 

These- plates  are  specially  designed  and  adapted  for  use  in  the  laboratory. 

All  the  plates  are  arranged  for  heat  regulation,  and  are  furnished  complete,  ready 
for  attachment  to  circuit,  no  cord  being  supplied,  as  the  main  line  wires  are  usually 
run  directly  to  the  plates  and  connected  with  the  binding  posts. 

Made  for  various  intermediate  voltages,  0  to  250. 

Voltages   must  be   specified  when  ordering. 


1050b 


1050c 


1050b  Hot  Plate,  Electric,  arranged  for  three  heats,  from  100°  to  600°  F. 
12x18         12x24         18x24         18x30  in. 


$25.00          35.00          60.00          70.00 
1050c  Hot  Plate,   Electric,   Round. 

8  in.  diameter,  3  heats   $14.00 

10  in.  diameter,  3  heats   16.00 

12  in.  diameter,  3  heats    18.00 


204 


THE  DENVER  FIRE  CLAY  COMPANY. 


HYDROMETERS 

Special  hydrometers  made  to  order  in  our  own  glass  blowing  department. 


1051 


1064 


1068 


1085 


No. 

1051 

1052 

1053 

1054 

1055 

1056 


Hydrometers,  Acid  and  Heavy  Liquids,  Beaume,  0  to  70  in  1-1° $0.50 

Hydrometers,  Acid  and  Heavy  Liquids,  Beaume,  0  to  90  in  1-1° 

Hydrometers,  Acid,  Beaume  0  to  30  in  y%°   

Hydrometers,   Acid,   Beaume,   30   to   60   in   %°    


75 

60 

60 

Hydrometers,  Acid,  Beaume,   60   to  66  in  1-10°    1.50 

Hydrometers,  Alcohol,  proof  and  Tralle  scale   60 

1056a  Hydrometers,  Alcohol,  Tralle  scale  4  in.  long,  for  small  quantities   1.00 


Note: — The  Specific  Gravities  of  all  liquids  are  referred  to  distilled  water  as  a 
standard,  the  unit  of  comparison  being  1,000  grains  of  distilled  water  at  a  temperature 
of  60°  Fahrenheit.  The  inconvenience  of  measuring  and  weighing  like  bulks  of  liquids 
led  to  the  construction  of  the  Hydrometer,  its  principle  of  operation  being  that  of  the 
law  of  floating  bodies,  i.  e.,  that  when  a  body  floats,  the  weight  of  the  bulk  of  liquid  dis- 
placed is  equal  to  the  weight  of  the  body  floated. 

The  scales  for  general  use,  Twaddle's  and  Beaume's  are  the  most  conspicuous; 


THE  DENVER  FIRE  CLAY  COMPANY.  205 


No. 

1057  Hydrometers,   Alcohol,   proof   and   Tralle   scale,   with   thermometer,   U.    S. 

Custom  House  standard,  with  mark  100  below  and  100  above  proof. .     $1.50 

1058  Hydrometers,  Alkali  and  Heavy  Liquids,  Beaume  scale,  0  to  50  in  1-1° 50 

1059  Hydrometers,  Ammonia  and  Light  Liquids,  Beaume  scale,  40  to  10  in  1-1°..         .50 

1060  Hydrometers,   Battery,  Beaume  scale -50 

1060a  Hydrometers,  Battery,  flat  bulb,  short,  for  storage  batteries 80 

1060b  Hydrometers,    Battery,    with    points,    Beaume    and    specific    gravity,    scale 

1.100  to  1.400   1.00 

1061  Hydrometers,  Cider,  Beaume  scale 50 

1062  Hydrometers,  Coal   Oil,  standard,  as  adopted  by  U.  S.  Petroleum  Associa- 

tion ;  Beaume  scale,  10  to  90  in  1-1° 50 

1063  Hydrometers,  Coal   Oil,  with  thermometer,  standard,  as  adopted  by  U.  S. 

Petroleum  Association;  Beaume  scale,  10  to  90  in  1-1° 1.50 

1064  Hydrometers,  Coal   Oil,  standard  as  adopted  by  U.   S.  Petroleum  Associa- 

tion; 10  to  20,  20  to  30,  30  to  40,  40  to  50,  50  to  60,  60  to  70,  70  to  80, 

80  to  90,  divided  in  1-10° Each      2.50 

1065  Hydrometers,  Glucose,  0°  to  5°  in  1-1° 1.00 

1066  Hydrometers,  Light  Liquids,  Beaume  scale 50 

1067  Hydrometers,   Light   Liquids,  Beaume  and   specific  gravity  scale,   0.700   to 

1.000    1.00 

1068  Hydrometers,  Light  Liquids,  with  thermometer,  Beaume  and  specific  gravity 

scale    1 .50 

1069  Hydrometers,   Light  Liquids,  standard,  0.700  to  0.800,  0.800  to  0.900,  0.900 

to  1.000   Each       1.00 

1070  Hydrometers,  Light  and  Heavy  Liquids,  universal,  0.700  to  2.000 1.50 

1071  Hydrometers,  Heavy  Liquids,  Beaume  scale .50 

1072  Hydrometers,   Heavy   Liquids,  Beaume  and  specific  gravity  scale,  1.000  to 

2.000 1.00 

1073  Hydrometers,  Heavy  Liquids,  with  thermometer,  Beaume  and  specific  grav- 

ity scale   1 .50 

of  the  latter  there  are  two  kinds,  or  from  0  to  70°  for  liquids  heavier  than  water,  and 
the  other  from  10  to  70°  for  liquids  lighter  than  water.  These  scales,  now  more  gen- 
erally in  use  among  manufacturers  than  any  other,  were  first  published  by  Beaume. 
He  constructed  his  Hydrometer  for  liquids  heavier  than  water  by  preparing  a  solu- 
tion of  salt  containing  15  parts  of  salt  and  85  parts  of  water  by  weight,  making  the 
scale  at  the  point  to  which  it  sank  in  pure  water  0,  and  in  the  15°  salt  solution  15, 
dividing  the  space  between  0  and  15  into  equal  parts  and  continuing  in  same  man- 


206  THE  DENVER  FIRE  CLAY  COMPANY. 


No. 

1074  Hydrometers,   Heavy  Liquids,  standard,  1.000  to  1.200,  1.200  to  1.400,  1.400 

to  1.600,  1.600  to  1.800,  1.800  to  2.000 Bach    $1.00 

1075  Hydrometers,  Lye,  Beaume  scale .50 

1075a  Hydrometers,  Milk,  giving  percentage  of  water  added 50 

1076  Hydrometers,  Milk,  N.  Y.  Board  of  Health  scale,  0-120° 75 

1077  Hydrometers,  Milk,  with  thermometer,  N.  Y.  Board  of  Health  scale,  0-120°. .       2.00 

1077a  Hydrometers,  Milk,  Quevenne's  1.00 

1077b  Hydrometers,  Milk,  Quevenne's,  with  thermometer 2.00 

1078  Hydrometers,  Naphtha,  Beaume  scale,  40°  to  100° 60 

1079  Hydrometers,  Salt  or  Pickle,  0°  to  100° 50 

1080  Hydrometers,  Silver,  "Actinometers,"  complete 50 

Hydrometers,  Spirits,  see  Hydrometers  for  Alcohol. 

1081  Hydrometers,  Sugar  and  Syrup,  Beaume's  scale,  0-50° 50 

1081a  Hydrometers,  Sugar,  Brix's  Scale,  plain,  0-30°  in  Vs 75 

1081b  Hydrometers,  Sugar,  Brix's  Scale,  with  thermometer 2.00 

1082  Hydrometers,  Vinegar 50 

1083  Hydrometers,   Low  Wine,  Tagliabue's  Standard 3.00 

1084  Hydrometers,  Wort  and  Beer,  Kaiser's  Saccharometers,  with  thermometer.  .        1.50 

Twaddle's  No.  1,      0  to     24— 1000  to  1120  S.  G 50 

Twaddle's  No.  2,     24  to     48—1120  to  1240  S.  G 50 

,  Twaddle's  No.  3,    48  to    72— 1240  to  1360  S.  G 50 

1085  Hydrometers,    / 

Twaddle's  No.  4,    72  to  100— 1360  to  1500  S.  G 50 

Twaddle's  No.  5,  100  to  134—1500  to  1670  S.  G 50 

Twaddle's  No.  6,  134  to  180—1670  to  1900  S.  G 50 

Hydrometers,  Urine,  see  Urine  analysis. 

Special    Hydrometers   made  to    order   from    sketch    or   description,    in    our    Glass 
Blowing  Department. 


ner.  For  his  Hydrometer  for  liquids  lighter  than  water  he  used  a  10°  solution  of  salt 
prepared  in  the  same  way,  fixing  0  as  the  point  to  which  this  Hydrometer  sank  and 
making  distilled  water  the  10  point,  and  obtained  a  scale  as  in  the  other  instrument, 
but  running  in  the  opposite  direction. 

Twaddle's  scale  is  converted  to  Specific  Gravity  by  multiplying  its  degrees  by  5 
and  adding  1000  (water)  e.  g.  24°  Twaddle's — 1120  Specific  Gravity. 


THE  DENVER  FIRE  CLAY  COMPANY. 


207 


INCUBATORS 


1086 


No.  1087a.  Incubator,  Opsonic, 
same  as  1087,  including  6  tubes, 
%  inch  diameter  in  the  top  to  hold 
test  tubes.  Size  14  inches  by  8 
inches  by  6  inches. 

Price    $25.00 


No.  1086.  Incubator,  Electrically 
heated,  very  substantially  built,  of 
heavy  copper,  lacquered,  with  three 
walls,  heavily  tinned,  insulating 
material  in  white  enamel.  Inside 
dimensions  14  ins.  high,  12  ins. 
wide,  10  ins.  deep.  Price,  including 
regulator,  thermometer  and  cord  for 
connecting,  ready  for  use. .  .$105.00 


No.  1087.  Incubator,  Opsonic, 
for  the  estimation  of  the  opsonic 
index,  with  20  tube  receptacles 
for  pipettes,  each  numbered. 
Made  of  heavy  polished  copper, 
with  tubulations  for  thermome- 
ter, gas  regulator  and  filler. 
Also,  a  cup,  1  by  ZVz  inches  for 
holding  instruments.  Size:  14 
ins.  by  8  ins.  by  4  ins.  Sheet 
iron  base  8  inches  high. 

Price    $20.00 


1087 


208 


THE  DENVER  FIRE  CLAY  COMPANY. 


1088 


1089 


No. 

1088  Incubators,  Bacteriological,  double  wall  for  water  only,  of  polished  copper 

on  sheet  iron  base. 

No.  1300.     10  in.  high,    8  in.  wide,    8  in.  deep  inside $36.00 

No.  1305.     12  in.  high,  10  in.  wide,  10  in.  deep  inside 42.00 

1089  Incubators,  Bacteriological,  three  walls,  having  both  air  and  water  space; 

of  polished  copper,  the  outer  surface  being  covered  with  insulating 
material  to  insure  an  even  temperature;  supported  on  sheet  iron 
base,  10  in.  high,  with  a  door,  having  a  mica  glass  for  observation  of 
the  flame. 

No.  1270.       9  in.  high,    7  in.  wide,    7  in.  deep  inside 35.00 

No.  1272.     12  in.  high,    9  in.  wide,    9  in.  deep  inside 45.00 

No.  1275.     14  in.  high,  12  in.  wide,  10  in.  deep  inside 60.00 

Larger  sizes  and  other  styles  of  incubators  quoted  upon  application. 


1090 

1090     Induction    Coils,    Ruhmkorff's,   with    automatic    brake    and    of   durable   make    on 
polished  mahogany  base. 


Length  of  spark 

Price 

Length  of  spark 

Price 


lin. 


$4.50 

iy2 


6.75 

2 


9.00 
3 


13.50 

4 


18.00 
6  in. 


$27.00         36.00        54.00        72.00       108.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


209 


JARS 


1091 


1092 


1092a 


No. 
1091 


Jars,  Anatomical;  with  a  thin  rubber  medium  under  the  lid  to  make  the  jar 
air-tight;  the  lid  is  securely  fastened  down  with  a  metallic  clamp.  To 
the  inner  surface  of  the  glass  lid  is  attached  a  glass  ring  for  the  con- 
venient securing  of  specimens. 


Width  of 
Mouth. 


Height 
without  Lid. 

.   4  in. . 


Capacity. 

pt. 


2  J  in 

2jin  ...............   6  in  ............       pt.. 

3£in  ...............    6  in  ............  l|  pts. 

3^  in  ...............   8  in  ............  2£  pts.  . 

3i  in  ...............  12  in  ............  4    pts.. 

5    in  ...............    8  in  ............  2  J  qts.  . 

5    in  ...............  12  in  ............  4    qts  . 

5    in  ...............  15  in  ............  5    qts.  . 

5    in  ...............  18  in  ...........    .6    qts.  . 

in.  .  .  8  in.  .  .  .  1 


61 

7|  in. . 
7f  in. . 
7f  in. . 
7f  in... 


gal. 


...   8  in 1£  gals. 

.  .  .12  in 2|  gals. 

...  18  in 3i  gals. 

...  24  in 4 J  gals. 


$0.50 

.60 

.90 

r.  10 

1.20 

i  .70 

i  .90 

2.IO 

2.30 

2.  2O 
3-20 

3.80 
4.40 

5  oo 


1092      Jars,  Specimen;  made  of  clearest  flint  glass,  with  mouths  nearly  as  wide 
as  jars  themselves,  and  glass  stoppers  carefully  ground  in. 


Diameter 
of  Body. 

3    in 

3f  in 

4*  in 

6    in 

6    in.. 


Height  to 
Shoulder. 

.  4  in. ... 
.  6  in. ... 
.  8  in. ... 
.  7  in. ... 
.  12  in. . 


Width  of 
Mouth. 

2i  in. 
3  in. 
3£in. 

..  4.  .  .5    in. 
.  .  5    in. , 


Capacity. 

.  14  oz.. . 
.  29  oz. .  . 
.  62  oz... 
.  98  oz. . . 
.168  oz. .  . 


•50 

•  70 

1. 10 

i  .70 

2.50 


1092a    Jars,  Specimen;  made  of  clear  white  glass,  with  wire  clamp;  glass  cover 
fitting  air-tight  with  rubber  ring. 

Capacity  %  Pt.         %  qt.        1  pt.        iy2  pt. 


Each 
Dozen 


$0.10 
1.20 


.15 
1.50 


.20 
2.00 


.25 
3.00 


210 


THE  DENVER  FIRE  CLAY  COMPANY. 


1093 


1093a 


1094 


1094a 


No. 

1093     Jars,  Storage,  plain  round  jars,  pressed  glass  lids. 
Capacity          %  %  1  gal. 


Each 


$0.40 


.60 


.85 


1093a  Jars,  Show  Bottles,  inverted,  for  ore  or  sugar  samples. 

Capacity  4  8  16  32  oz. 

Each  $0.15  120  [25  AO 

Dozen  1.50  2.00  2.50  4.00 


gal. 


?0 
7.00 


1094 


Jars,  screw  capped,  nickel-plated  cover,  high  form. 
Capacity  4  8  16  oz. 


Dozen 


$1.00 


1.50 


2.00 


1094a  Jars,  screw  capped,  nickel-plated  cover,  low  form. 
Capacity  1  2  4  oz. 


Dozen 


$0.60 


.80 


1.00 


1095 


1097 


1095     Jars,  Precipitating,  with  lip;  stout  glass. 

Capacity  %  pt.       %  pt.       1  pt. 

Each~~ 


Iqt. 


1098 


2  gal. 


$0.20 


1097     Jars,  Specie,  with  japanned  tin  covers. 
Capacity        Pt.  Qt. 


.35 


.50 


.80 


1.25 


2.50 


gal. 


1  gallon. 


Each 


$0.20 


.30 


.50 


1098     Jars,  Stoneware,  with  handles  and  cover,  "Waste  Jars." 
Capacity  1234 


Each 


$0.40 


.60 


.80 


1.00 


.75 


5  gallons. 
1.20 


THE  DENVER  FIRE  CLAY  COMPANY. 


211 


1099 
No. 

1099  Knives,  Amalgam.    With  handle,  blade  ^/z  inches  wide $0.50 

1100  Knives,  of  steel,  for  cutting  glass  tubing .75 


SILVER  NITRATE 


Ag  N  03 


1101 

1101       Label  Books,  with  names  and  formulas  of  the  most  used  chemicals  and  re- 
agents; strip  form,  gummed  and  perforated  


.40 


1102 


1102 


1102       Labels,  gummed  paper,  red  colored  rims,  Nos.  201,  209,  217,  223,  261. .  .Box    $0.08 

No.  2004  2007  2002  2001  2006 

Size  2%xl  in.     2%xl%  in.     37/8xl  in.     3%xl%  in.     4x1%  in. 

Per  box          $0.12  .15  .18  .20  .25 


1103 

1103       Ladles,  Melting,  wrought  iron,  with  lip. 
Dia.  2y2  3 

Each  $0.30  .40 


.50 


.60 


.80 


212 


THE  DENVER  FIRE  CLAY  COMPANY. 


LAMPS 


1112 


1112a 


1113 


1113a 


No. 
1111 


1112 


1112a 


1113 


1113a 


With  ground  on  cap,  wick  and  wickholder. 
2  4  8  oz. 


Lamps,  Alcohol,  glass. 
Capacity 

Each          $0.25  .30  .40 

Lamps,  Alcohol,  glass.    With  ground  cap,  wick  and  wickholder,  side  tubu- 
lature  and  stopper. 

Capacity  1 2  4 8  oz. 

Each  $0.35  .40  .50  .60 

Lamps,   Alcohol,   glass.     With  nickel-plated   screw   caps,   wick  and  wick- 
holder.   A  great  improvement,  over  the  ordinary  glass  cap  lamp. 
Capacity          2  4  8  oz. 

Each 
Lamps,  Alcohol,  brass. 

Capacity          2  4  8  oz. 

Each 


$0.20  .25 

With  screw  top. 
2  4 


.35 


$0.50  .60 

Lamps,  Alcohol,  brass.    With  ratchet  burner. 
Capacity          3  5  oz. 


.80 


Each 


$0.60 


.75 


KVICK   HOLDER   TURNED 
HALF.  A  REVOLUTION. 


1114 


1115-16 


1118 


1114  Lamps,  Alcohol,  Clark's.    Having  nine  facets  on  the  font,  it  may  be  readily 

adjusted  to  any  required  position.     Very  desirable  for  chemists'  and 
assayers'  use.     Suitable  also  for  heavy  oil. 

Capacity          2  4  4    oz. 

Burner        3-16  %  Vz  in. 

Each  $0.60  .75  .90 

1115  -Lamps,  Fletcher's.     For  sperm  oil,  of  polished  brass $0.70 

1116  Lamps.     Same  as  above,  nickel-plated 1.00 

1116a     Lamps,  Fletcher's.    A  modified  form  of  No.  1115,  for  tallow  or  solid  fats. . .  .40 

1117  Lamp  Wicks  for  above  lamps Bundle  .10 

1118  Lamps,   Berzelius,  brass.     With  Argand  burner,  for  alcohol  or  kerosene, 

with   adjustable   wickholder 4.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


213 


1119 


1120 


No. 

1119 


Lamps,  Rose's,  brass.    With  sliding  rod,  chimney,  triangle,  and  two  brass 

rings,    on    mahogany    base $6.00 


1120  Lamps,   Plattner's,   nickel-plated.     On   stand 3.00 

1121  Lamps,  Plattner's,  nickel-plated.     With  patent  swivel 4.00 


1121 


1124 


1123 


1123  Lamps,  Dangler's  Laboratory.  For  gasoline.  The  most  intense  heat  can 
be  obtained  from  this  burner,  which  can  be  easily  and  instantly  regu- 
lated at  will;  pressure  regulated  by  rubber  bulb Net  6.00 

Same,  with  copper  tank . .  Net      7.00 


1123a     Burner,    for    same,    only 

1124       Extra    Rubber    Bulbs,   for   same.. 
1124a     Extra  Cones  or  Grates,  for  same. 


.Net 


2.50 
.40 
.20 


214 


THE  DENVER  FIRE  CLAY  COMPANY. 


1125 


1126a 


1127 


No 

1125 


Lamps,  Kellogg's.  For  gasoline.  Indispensable  where  a  Bunsen  Burner 
flame  is  required  and  no  gas  available.  It  gives  as  much  heat  as  sev- 
eral Bunsen  Burners,  and  is  better  than  alcohol  lamps.  There  is  no 
smell,  as  the  gas  is  consumed  as  soon  as  produced,  no  wick  neces- 
sary. Complete,  as  per  sketch $12.00 


1126      Burner  only,  for  No.  1125 7.50 


1126a  Lamps,  Kellogg's  Gasoline  Laboratory  Lamp  No.  2.  This  lamp  gives  a  pure 
blue  flame  and  intense  heat.  Can  be  easily  and  instantly  regulated  at 
will.  The  slide  grate  allows  articles  to  be  placed  as  near  fire  as  de- 
sired. Can  be  kept  hot  for  use  by  putting  cap  on  top  of  burner  and 
turning  off  part  of  the  force  of  vapor  


6.00 


1127      Lamps,  Kellogg's  New  Vapor  Lamp.    Can  be  used  in  sets  of  two  or  more 

lamps,   using  the   same  tank 3.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


215 


No. 
1128 


1129 


1128  .       1129 

Lamps,  Parting.  By  H.  W.  Leavens;  for  alcohol;  galvanized  iron,  very 
strong;  shelves  for  sand  bath  and  annealing  cups;  upper  shelf  per- 
forated for  holding  test  tubes. 

Burners  6  8  12 

Each  $3.00  3.50  4.50 

Lamps,  Parting.    Same  as  preceding,  except  upper  shelf  is  left  out  so  as  to 


use  flasks  instead  of  test  tubes, 
off  fumes. 

Burners  6 


Hood  and  pipe  attached  for  carrying 


8 


12 


Bach  $3.50  .4.00  5.00 

1129a     Lamps,   Parting,    for   gas.     A.    H.    Low's   design.     Twelve   burners,    with 
hinged  top  for  parting  and  annealing. 


1131 


1132 


1130 
1131 
1131a 


1132 


1133 


1134 


1133  1134 

Lamp  Wicks  for  parting   lamps Doz. 

Lead  Measures,  of  improved  construction,  for  test  lead 

Lead  Foil,  chemically  pure.    Put  up  in  rolls  the  following  widths,  2,  3,  4,  5 
and  6  inch.    Please  state  width  wanted  in  ordering. 

Price,    per    Ib 

Lenses;  see  Magnifiers. 
Levels,  glass;  not  mounted. 

Length  3  4  5  6  in. 


$0.10 
.25 


.25 


Each  $0.12  .15 

Levels,  mounted;  in  nickel-plated  cases. 
Length  3  4 


.20 

5  in. 


.25 


Each  $0.30  .40 

Levels,  round  brass  case;   nickel-plated,  1 


.50 


in.  dia. 


.75 


216 


THE  DENVER  FIRE  CLAY  COMPANY. 


C.  P.  Litharge,  C.  P.  Test  Lead 

C.  P.  Lead  Foil 


It  is  a  matter  of  general  knowledge  among  users  of  these  materials  that  the  Pueblo 
Brand  manufactured  by  the  American  Smelting  and  Refining  Company  at  their  Pueblo 
Refinery  is  the  purest  grade  of  Litharge  and  Test  Lead  known  to  the  trade. 

It  is  not,  as  yet,  so  generally  known,  however,  that  the  Denver  Fire  Clay  Company 
take  their  entire  output  and  are  their  Sole  Selling  Agents.  These  productions  are  free 
from  gold,  silver  and  bismuth  and  are  uniform  in  this  respect,  invariably.  The  conse- 
quence is,  consumers  are  never  required  to  make  preliminary,  or  trial,  assays  for  their 
insurance  in  doing  control,  umpire  or  bullion  work,  or  to  question  results  obtained  from 
their  use. 

The  question  of  C.  P.  Lead  Foil  is  always  a  matter  of  first  importance,  particularly 
at  Cyanidation  works  where  much  solution  and  bullion  assayingi  is  required.  We  wish 
to  state  that  all  of  our  foil  is  made  up  by  us  from  the  Pueblo  Brand  of  C.  P.  Pig  Lead 
and  is,  therefore,  free  from  gold  and  silver  values  in  every  instance,  insuring  our  cus- 
tomers against  error  or  loss. 

Our  quotations  on  C.  P.  Litharge,  Test  Lead  and  Lead  Foil  compare  most  favorably 
with  those  of  other  houses  handling  the  commercial  grades  only,  and  the  safety  against 
error  insured  by  their  use  prompts  us  to  suggest  that  you  cannot  afford  to  use  any  other 
Brand. 

In  addition  to  the  C.  P.  Goods,  we  carry  a  heavy  stock  of  the  commercial  grades  of 
Litharge,  all  of  which  are  free  from  gold  and  suitable  for  work  in  districts  where  the 
presence  of  slight  amounts  of  silver  is  not  a  factor  of  moment.  If  you  have  ever  had 
difficulty  in  getting  C.  P.  Litharge  or  Test  Lead,  specify  the  A.  S.  &  R.  Pueblo  Brand  and 
Denver  Fire  Clay  Lead  Foil.  They  are  absolutely  pure  and  reliable  at  all  times. 


THE  DENVER  FIRE  CLAY  COMPANY. 


217 


1135 


1136 


1137 


No. 
1135 

1136 


1137 


Leveling  Stands,  three-sided,  with  set  screws $3.50 

Litmus  Pencils,  of  chemically  pure  litmus,  blue  on  one  end,  red  on  the 

other    ,  k. .         .25 


Magnets,  Bar,  straight. 
Size 


10  in. 


Each 


$0.20         .25 


.30 


.40 


.50 


1138 


1139 


1140 


1140a 


1138 


1139 


1140 


Magnets,  Horseshoe.     Superior  quality. 
Size  2         2%     3         4 


6 


8       10      12  in. 


Each 


$0.05      .06      .10      .12      .15      .25      .70    1.20    2.00 


Magnets,  Horseshoe,  Compound.    Four  bars. 
Size  6  8 


10  in. 


Each           $4.00                6.00                10.00 
Mailing  Envelopes,  of  paper.     (See  No.  1216). 
Mallets,  rawhide.     Best  quality,  dia.  2%  in 


$     .75 


1140a     Mallets,  fiber  ends.    Best  quality. 

Dia.  2  2l/2  in. 


Each 


$0.90 


1.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


MAGNIFYING  GLASSES 


1141 


1142 


No. 

1141       Magnifiers,  in  rubber  case,  folding,  best  quality.    1  in.  diameter. 
Glasses  123 


Each 


$0.40 


.75 


1.00 


1142       Magnifiers,  in  metal  case,  folding,  best  quality. 
Glasses  1  2 


Bach 


$0.50 


.80 


1.00 


1143 


1143a 


1143       Magnifiers,  Coddington's.    In  metal  case,  nickeled. 
Dia.  V2  % 

Each 


lin. 


$1.50 


1.75 


2.00 


1143a 


Magnifiers,  "Globe."  The  Globe  lens  is  a  perfect  sphere,  consisting  of  a 
hollow  flint  glass  globe,  made  in  halves,  and  inclosing  a  solid  crown 
glass  globe.  By  the  principles  of  its  construction  the  aberrations  are 
corrected  to  a  higher  degree  than  has  heretofore  been  obtained  by 
any  other  construction.  This  lens  has  an  optical  axis  in  any  direc- 
tion, hence  the  field  is  perfectly  flat  and  distinct  to  the  outer  edge; 
an.d  what  is  true  of  no  other  lens,  the  field  is  always  the  largest  possi- 
ble. Pocket  Magnifiers  made  on  this  principle  are  furnished  as  fol- 
lows: 

No.  290 — 1-inch  focus,  nickel-plated  brass  mount,  magnifying  11  diam- 
eters  $    4.00 

No.  291 — %-inch  focus,  nickel-plated  brass  mount,  magnifying  14  diam- 
eters       5.00 


No.  292 — %-inch  focus,  nickel-plated  brass  mount,  magnifying  21  diam- 
eters   6.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


219 


1144 


No. 
1144 
1145 
1146 


1145 


1146 


Magnifiers,  thread  counters.     Folding,  brass  frame,  ^4 -inch $0.30 

Magnifiers,  tripods,  brass.    With  screw  adjustment  for  focus 50 

Magnifiers,  new  "aplanatic."     Giving  a  perfectly  flat  field  of  great  bril- 
liancy and  definition.     Illustration  giving  full  size   1.00 


1147 


1148 


1148a 


1147 


1148 


Magnifiers,  "reading  glasses,"  best  quality.     Very  best  finished  lens,  nickel- 
plated  frame. 

Dia.  2  2%  3  3%  4  4%  5  in. 


Each        $0.50          .70 

.80 

1.20          1.50          2.00          3.( 

Measures,  Agateware,  with  handles. 
Capacity       pt. 

qt. 

y2  gal.                1  gal. 

Each          $0.40 

.50 

.75                     1.00 

Measuring  Tapes,  steel,  inches  and  centimeters, 
Length          3                        6 

in  German  silver  case. 
12ft. 

Each 


$1.50 


2.25 


3.50 


220  THE  DENVER  FIRE  CLAY  COMPANY. 

Bausch  &  Lomb  Petrographical  Microscope 

Stand  LA 


This  microscope,  which  possesses  all  the  features  essential  to  a  laboratory  instru- 
ment, has  been  very  popular  for  petrographical,  mineralogical,  and  crystallographic  work. 
The  stand  at  the  price  is  a  very  desirable  one  for  students'  use,  being  strong  and  simple 
in  construction,  easily  manipulated,  and  first-class  in  every  detail.  Attention  is  directed 
to  the  illuminating  apparatus  described  in  the  specifications,  and,  while  regularly  listed 
with  the  quick  changing  nosepiece,  either  of  the  others  will  be  furnished  at  the  differ- 
ence in  price. 


THE  DENVER  FIRE  CLAY  COMPANY. 


221 


SPECIFICATIONS. 
Base — Horse-shoe  form. 
Pillar — Round,  and  without  inclination  joint. 

Arm — Standard  construction,  giving  a  distance  of  47  mm.  to  the  center  of  the  stage. 
Grooved  for  attaching  the  mechanical  stage. 

Mirror — Plane  and  concave,  43  mm.  in  diameter,  and  mounted  on  a  swinging  arm. 

Stage — Circular,  measuring  76  mm.  inside  and  88  mm.  outside  the  graduations,  which  are 
in  single  degrees  and  read  by  a  convenient  vernier.  With  vulcanite  top  and  provided 
with  two  scales  at  right  angles  to  each  other,  graduated  in  millimeters,  making  it 
useful  in  the  location  of  objects.  Centering  screws  are  provided. 

Substage — A  mounting  for  the  polarizer  or  condenser  is  focused  by  a  quick  acting  screw, 
which  also  throws  the  substage  out  of  axis  when  desired. 

Focusing  Adjustment — Coarse  adjustment  by  rack  and  pinion,  fine  adjustment  of  prism 
form  with  micrometer  screw  having  a  large  head. 

Body  Tube — Slotted  for  the  Bertrand  lens  used  in  magnifying  interference  figures.  There 
is  adjustment  for  focusing.  The  prism  box  containing  the  analyzer  is  movable,  so 
that  the  analyzer  may  be  removed  from  the  axis  when  desired.  Slot  for  quartz 
wedge,  %  undulation  mica  plate,  or  gypsum  plate,  red,  first  order,  is  provided.  This 
slot  may  be  closed  when  accessories  are  not  used.  Standard  size  eyepieces  are 
used,  and  a  diaphragm  is  included  for  use  above  the  eyepiece  to  sharpen  the  image 
of  the  interference  figures. 

Polarizer — A  medium  size  Nicol  prism  in  a  revolving  mount,  graduated  in  single  degrees 
and  used  in  the  substage.  An  iris  diaphragm  is  mounted  below  the  prism. 

Analyzer — A  medium  size  Nicol  prism  mounted  in  the  sliding  prism  box. 

Illuminating  Apparatus — A  two  system  condenser  to  give  converging  rays  of  polarized 
light.  The  upper  lens  of  this  condenser  is  mounted  in  a  metal  hemispherical  shell 
attached  to  the  polarizer  mounting  so  that  it  can  be  instantly  brought  into  the  op- 
tical axis  or  thrown  out.  This  construction  gives  the  greatest  convenience  in  use 
without  increasing  the  thickness  of  the  stage  or  in  any  way  disturbing  the  arrange- 
ment of  the  other  optical  parts. 

Weight — The  LA4  weighs  8  Ibs.  12  oz.;  in  carrying  case,  16  Ibs.  3  oz.;  packed  for  ship- 
ment, 25  Ibs. 

Case — The  instrument  is  supplied  in  a  polished  mahogany  carrying  case  with  brass  lock 
and  key. 

PRICE   LIST   LA   MICROSCOPES. 


Catalogue 
Number 

OBJECTIVES 

Cross  Hair 
Eyepieces 

Quick  Changing 
Nosepiece 

Price 

DRY 

LA1 
LA2 
LA4 

BL 
BE 
UP 
2035B 

16  mm.     4  mm. 
16  mm.     4  mm. 
32  mm.     16  mm.     4  mm. 

10X     5X 
10x     5X 
10x     5X 

With  Two  Rings 
With  Three  Rings 

$  90.00 
94.00 
100.00 

5.00 
25.00 
4.00 
13.50 

Bertrand  Lens  for  magnifying  interference  figures,    each 
Bertrand  Quadrant  Eyepiece  with  revolving  prism,    each 
Quarter  Undulation  Mica  Plate,  mounted     -      -      each 
Analyzer,  Style  B      each 

222 


THE  DENVER  FIRE  CLAY  COMPANY. 


A  New  Petrographic  Microscope 


Made  after  the  specifications  of 

DR.  CHARLES  P.  BERKEY, 
Columbia  University,  New  York. 

This  instrument  has  been  devised  especially  to  meet  the  requirements  of  large  labo- 
ratory classes  in  petrography. 


THE  DENVER  FIRE  CLAY  COMPANY.  223 


It  is  a  simple  and  nicely  adjusted  microscope  with  first-class  workmanship  and 
the  best  lenses,  but  with  only  the  most  essential  accessories.  It  is  a  high-grade 
stand  with  all  the  necessary  equipment  for  ordinary  class  uses,  and  more  accept- 
able for  general  class  purposes,  because  it  is  less  cumbered  with  elaborate  and  seldom- 
used  devices. 

The  stand  is  inclinable,  with  graduated  draw  tube. 

It  is  fitted  with  a  rack  and  pinion  coarse  adjustment  and  a  micrometer  movement 
of  the  ordinary  type. 

The  condenser  and  polarizer  (19°  aperture)  may  be  raised  and  lowered  by  a  lateral 
screw.  The  transition  from  convergent  to  parallel  light  is  effected  by  a  quarter  turn  of 
a  milled  head  at  the  side,  which  throws  the  two  upper  lenses  of  the  triple  condenser 
out  of  action.  The  polarizer  is  marked  at  0°,  90°,  180°,  270°  and  is  easily  removed  from 
the  condenser  sleeve.  The  zero  point,  which  coincides  with  the  principal  meridian  of 
the  microscope  (0° — 180°)  is  at  the  front  of  the  stand  and  marked  by  an  index  line  in 
the  condenser  sleeve.  The  stage  is  graduated  into  360  degrees.  Its  rotation  is  read  by 
an  index.  The  stage  is  provided  with  a  finder.  The  centering  head  attached  to  the 
lower  end  of  the  tube  has  an  opening  for  the  introduction  of  selenite  and  mica  com- 
pensators. 

The  analyser,  which  is  above  the  centering  head,  may  at  pleasure  be  thrown  in 
and  out  of  action. 

The  upper  part  of  the  tube  has  a  slit  for  the  reception  of  a  slide  containing  a 
Bertrand  lens. 

The  stand  is  equipped  with  the  following  optical  parts: 

Eyepieces  II  and  III,  with  adjustable  eye  lenses  and  cross  lines; 

Achromatic   Objectives  No.   3   and   6    (%"  and   %"  respectively),   securing 
magnifications  of  70,  80,  300,  350  diameters; 

Objective  Clutch  and  adaptors  for  rapidly  changing  objectives; 

Bertrand  Lens; 

Mica  Plate  %  undulation; 

Selenite  Plate  first-order  red,  both  test  plates  mounted  with  axis  of  elas- 
ticity at  45°  to  cross  lines  and  reversible; 

Quartz  Wedge  three-order,  mounted  with  axis  of  elasticity  at  45°  for  inser- 
tion in  same  slot  as  other  test  plates. 

Complete  in  polished  mahogany  case  with  lock  and  key  $120.00 

Incorporated  Educational  Institutions  can  obtain  these  instruments  free  of  duty, 
prices  on  application. 


224  THE  DENVER  FIRE  CLAY  COMPANY. 

New  Model  Microscope 

Stand  BB 


We  carry  a  full  line  of  Microscopes  and  Accessories  for  use  in  Schools,  Colleges  and 

Universities;   Biological  and  Bacteriological  Laboratories. 

CATALOGUE  ON   APPLICATION. 


THE  DENVER  FIRE  CLAY  COMPANY. 


225 


BALL  MILLS 

(Laboratory  Sizes.) 


In  offering  these  laboratory  mills,  we  desire  to  call  special  attention  to  the  fact 
that  the  Porcelain  Jars  of  these  machines  are  imported,  that  they  are  manufactured 
from  the  finest  raw  materials  obtainable,  made  in  the  plastic  state,  thus  forming  Jars 
that  are  impervious  to  the  action  of  even  such  materials  as  ink.  These  Jars  are  of  so 
superior  a  quality  that  constant  use  of  them  has  never  worn  them  out. 


'THE    LITTLE    TROJAN." 


1149 


No. 

.1149 


1150 


The  Jar  measures  22x24  mm.  outside;  will  handle  from  a  few  ounces  up 
to  5  pounds  at  a  charge.  Shipping  weight,  120  pounds.  Floor  space 
10^x25  inches.  Hand  wheel  pulley,  9x1  inches;  60  revolutions  per 
minute.  Price $30.00 

"Double   Trojan"    Mill,   for   two   jars,   shipping  weight   195   pounds,   floor 

space  10%  x  38  inches.     Price 50.00 

Larger  sizes   quoted  upon  application. 


226  THE  DENVER  FIRE  CLAY  COMPANY. 


MORTARS 


1151  '  1152  1153  1154 

No. 

1151     Mortars,  agate.    With  pestles;  best  quality. 

Dia.  iy2         2  2%         3  3%         4  in. 


Each  $1.50  2.25          3.50  5.00         8.00      9.50 

Dia.  4%  4V2          5  5%           Gin. 

Each  $11.00  14.00     18.00  25.00       35.00 

1152     Mortars,  Diamond,  Plattner's.  For  crushing  small  quantities  of  ore  or  for 

flattening  silver  buttons;   made  of  the  best  tool  steel,  hardened  and 
well  finished. 

Size  Small  Large 


Each  $3.60  5.50 

1153  Mortars,  Diamond,   Lead's.     Of  hardened  steel $2.00 

1154  Mortars,  steel.     Polished  inside  and  out;  with  pestle. 

Dia.  3V2  4%  6V2  in. 


Each  $1.75          2.25  3.00 


1155  1156  1156a 


1155     Mortars,  glass.    With  lip  and  pestle. 

Capacity  2  4  8  16  32  oz. 


Each  $0.25  .30  .40  .60  .80 

1156     Mortars,  porcelain,  shallow  form.  Best  make,  with  lip,  rough  inside;  pestle 
all  porcelain. 

Capacity         1%  2  3  6          10          16          22          32  oz. 

Dia.  2V2  2%         3%         4  4^         5^         6*£     7^  in. 

Each  $0.25  i30 AO         ^0          &Q .86 1XK)      1.25 

lloGa  Mortars,  porcelain,  deep  form,  for  mixtures,  etc. 

Dia.  3%  4  5  6  7  Sin. 

Each  $0.45          .60          .80         1.10        1.40        1.60 


THE  DENVER  FIRE  CLAY  COMPANY. 


227 


MORTARS 


1157 


1159 


No. 

1157     Mortars,  Wedgewood.    Best  quality;  pestle  with  wooden  handle. 

No.  0000       000         00  0  1  2  3 


Dia. 

3 

3^4 

3y2 

4 

4y2 

5 

6      6y2  in. 

Capacity 

2 

3 

4 

6 

11 

16 

24 

30  oz. 

Each 

$0.40 

.45 

.50 

.55 

.60 

.80 

1.00      1 

.10 

No. 

5 

6 

7 

8 

9 

10 

12 

Dia. 

7 

8 

8% 

9% 

10  y2 

12 

14  in. 

Capacity 

40 

48  c 

>z.3y2 

4% 

7 

10 

17pts 

Each 

$1.40 

1.80 

2.25 

3.00 

3.50 

4.50 

6.00 

1158     Mortars,  iron,  No.  1,  high  style.    Best  quality  for  powdering  ore. 

Capacity  1  pt.        1  qt.        V2  1  2  3  gal. 

Each  $0.60          .90         1.25         2.25         4.00         6.00 


1159     Mortars,  Iron,  Bell-shape,  with  pestle. 

Approx.  Capacity        Vz 
Dia.  4 


1        2         4pt.     1        2        3  gal. 
5     5%     6%          9      11       14  in. 


Each 


$0.50      .75    1.00    1.50      2.50    5.00    8.00 


228 


THE  DENVER  FIRE  CLAY  COMPANY, 


MORTARS 


1160 
Code  Word,  "Casmort." 


No. 

1160     Mortars,  Case-Buck's,  improved,  of  iron,  our  own  make.     For  grinding  and 

amalgamating.     By  the  rotation  of  the  muller  a  large  sample  of  ore 

can  be  ground  in  contact  with  quicksilver. 

Dia.  6y2  8%  in. 


Weight 
Muller 


30 
16 


761bs. 
49  Ibs. 


Each 


$7.50 


10.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


229 


MOULDS 


1172 


1173 


No. 
1172 

1173 


Moulds,  Ingot  or  Bullion,  inside  1%'x  1%  x  8  in.,  with  sliding  bar  to  cast  any 

length  desired,  capacity  150  oz.  gold,  75  oz.  silver  $     1.25 

Moulds,  Ingot  or  Bullion.    Capacity  of  moulds  is  figured  filled  to  about  3-16 
in.  of  top. 


Capacity  in  ozs.        Capacity  in  ozs. 


Size,  Inches 
3%  xl     xl       

Pure  Gold 
.  .      .       20 

Silver 
10  ...           

50  

25   

4     x2     x2       

100  .    . 

56  

250  

140   

6%  x  3%  x  31,4    

500 

275   

9      x3%  x3%    

1000 

550 

11      x4%x4%    

2000  

1100   

2500 

1350                   .    .    .  . 

15      x7      x6       

.  .    .  .  5000 

3000 

ing  on  above  moulds,  t 

>er  letter.  . 

.75 
1.00 
1.25 
2.00 
2.50 
3.50 
5.50 
6.50 
8.00 

.06 


1175 


1176 


1175  Moulds,  Pouring,  iron,  with  3  conical  depressions,  bottom  running  down  to 

a  fine  point,  wood  handle;  for  lead  or  scorification $      .75 

1176  Moulds,  Pouring,  iron,  with  6  conical  depressions  and  handle,  bottom  run- 

ning down  to  a  fine  point;  for  lead  or  scorification  .75 


230 


THE  DENVER  FIRE  CLAY  COMPANY, 


1179 


1181a 


No. 

1177 

1178 
1178a 

1178b 
1179 

1180 

1181 
1181a 


Moulds,  Pouring,  iron,  with  12  conical  depressions,  2%  in.  dia.,  1  in.  deep; 

for  crucible  or  scorification  assays $1.00 

Moulds,  Pouring,  iron,  with  12  conical  depressions,  3  in.  dia.,  1%  in.  deep; 

for  crucible  or  scorification  assays 1 .75 

Moulds,  Pouring,  iron,  with  20  conical  depressions,  2%  in.  dia.,  1  in.  deep; 

for  crucible  or  scorification  assays 2.00 

Moulds,  Pouring,  Goldfield  Consolidated  Special,  with  21  holes 4.00 

Moulds,  Pouring,  cast  iron,  with  25  spherical  depressions;  for  crucible  or 
scorification  assays 

Moulds,  Pouring,  heavy  solid  iron,  with  two  conical  machined  depressions, 
2%  in.  dia.,  1%  in.  deep;  wood  handles;  for  crucible  and  scorifica- 
tion assays  

Moulds,  Pouring,  heavy  solid  iron,  with  6  conical  depressions,  21/4  in.  dia., 

1%  in.  deep,  cast  iron  ring  handle;  the  slag  will  cool  rapidly 2.50 

Moulds,  Pouring,  as  above,  with  6  conical  depressions,  2  in.  dia.,  1%  in. 

deep,  with  wrought  iron  ring  handle 3.00 


1.50 


1.50 


W  1 1 A 
4114 

i  1 1  i  * 
1111  1 

1 1 1.1 


1183 


1178b 
Moulds,  Pouring. 


1183 


Size  for  Weight,  Ibs. 

No.  7— Black  Lead    Crucible 16 $  2.25 

No.  10 — Black  Lead   Crucible 27 4.00 

No.  16— Black  Lead   Crucible 35 ,  . .  5.00 

No.  25 — Black  Lead   Crucible 50 6.50 

No.  35— Black  Lead   Crucible 60 7.50 

No.  50— Black  Lead   Crucible 85 8.75 

No.  80— Black  Lead   Crucible 105 10.00 

No.  100  or  125— Black  Lead  Crucible..         ..135..  12.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


231 


Manufacture  and  Care  of  Muffles 


We  manufacture  more  Muffles  than  all  other 
manufacturers  combined. 


The  Denver  Fire  Clay  Company's  Muffles  are  known  the  world  over  as  the  standard 
of  excellence.  This  perfection  is  due  in  part  to  the  extreme  purity  of  our  clay,  but  mainly 
to  the  extraordinary  care  and  attention  we  have  given  to  exact  proportions  in  their  mix- 
ture before  moulding.  These  proportions  have  only  been  learned  through  long  experi- 


232  THE  DENVER  FIRE  CLAY  COMPANY. 


ence  and  innumerable  preliminary  trials,  and  are  known  only  to  the  head  of  this  de- 
partment, who  has  been  in  our  employ  for  nearly  thirty  years. 

They  have  many  imitators,  but  absolutely  no  equals;  our  thousands  of  satisfied  cus- 
tomers in  all  parts  of  the  world  testify  to  this. 

Occasionally  we  hear  of  someone  who  is  not  realizing  the  fullest  value  from  his 
muffles.  By  investigation  we  have  almost  invariably  found  it  to  be  a  matter  of  wrong 
position  of  their  supports,  or  insufficient  support. 

We  have  compiled  data  gathered  from  all  parts  of  the  world  on  this  subject,  and  the 
position  and  width  of  the  support  is  a  matter  of  nice  adjustment.  As  it  depends  on  the 
size  of  the  muffle  (we  carry  one  hundred  and  fifty  stock  sizes)  no  set  rule  can  be  given, 
but  generally  speaking  one  wide  support  has  a  much  better  effect  than  two  whose  joint 
width  is  the  same,  and  the  moving  of  the  support  sometimes  as  little  as  a  half  inch  has 
a  very  great  effect  on  the  life  of  the  muffle.  See  method  of  supporting  muffles,  Case 
Patent  and  tile  lined  furnaces. 

It  must  be  always  borne  in  mind  that  clay  goods  readily  absorb  moisture  and  a  per- 
fectly annealed  muffle  is  a  necessity  to  the  realization  of  its  full  value.  They  should 
always  be  stored  in  a  warm,  dry  room,  and  just  prior  to  being  put  into  service  should 
be  placed  on  top  of  the  furnace  for  several  days.  Attention  to  such  small  details  will  be 
found  to  materially  cut  down  the  yearly  consumption. 

If  you  are  not  realizing  full  efficiency  from  muffles  of  our  make  let  us  hear  from 
you,  as  we  are  confident  it  is  a  wrong  local  condition  which  can  be  corrected.  It  is  a 
pleasure  to  answer  inquiries  of  this  nature,  as  we  wish  to  extend  every  assistance  !in 
adding  to  the  life  and  service  of  our  goods.  We  find  in  the  long  run  it  pays. 

If  you  are  using  any  other  make,  you  are  not  getting  the  best. 

Muffles  should  always  be  ordered  by  Letter  or  Number,  as  on  account  of  small  dif- 
ference in  the  size  of  many  muffles  description  by  letter  reduces  chance  of  error  to  a 
minimum.  If  necessary  to  give  other  specifications  give  outside  dimensions.  If  you 
cannot  find  in  this  list  a  size  to  fit  your  requirements,  we  will  be  pleased  to  make  to 
order  any  special  sizes  and  as  quickly  as  possible. 

Note  if  your  muffles  are  stamped  "DENVER  FIRE  CLAY  COM- 
PANY." None  are  genuine  otherwise.  They  have  many  imitators,  but 
positively  no  equals.  By  specifying  "THE  DENVER  FIRE  CLAY  COM- 
PANY" you  get  products  of  a  house  with  a  record  who  stand  back  of 
their  goods. 

See  our  list  of  Special  Muffles  on  pages  235-6. 


THE  DENVER  FIRE  CLAY  COMPANY, 


233 


MUFFLES 


The  Best  in  the  World 


MUFFLES,  D.  F.  C.  CO. 


Outside  Measurements. 
Always  used  in  specifying  Muffles. 


Inside  Measurements. 
For  determining  capacity. 


Letter 
AAA 

Width 
2-J-  in.    . 

Length 
.  .   6    in.  .  . 

Height 
il  in.  . 

Shape 

2  .  . 

Width 

Side        < 
Height 

Grreatest 
Height 

AA 

3    in. 

7    in. 

2!  in. 

2 

BB. 

.   ^1  in.  . 

.  .   6    in.    . 

.  .   2^  in.  . 

.  .     2.  .  . 

CC 

A\  jn. 

8    in. 

\    in. 

2 

C. 

.   4!  in.  . 

.  .   8    in.  .  . 

Sin.  . 

.  .  .2.  .  . 

HH. 

.   sl  in.  . 

.    7l  in. 

4.1  in.  . 

2     . 

H. 

.   si  in.  .  . 

.  .  10!  in.  .  . 

.   3!  in.  . 

.  .     2.  .  . 

CJ. 

.  6    in.  .  . 

.  .  12    in.  .  . 

4    in.  . 

.  .  .  2  .  . 

.   41  in. 

.      1  J  in.  .  . 

.     3J  in  

CF. 

.   6    in  ... 

9    in. 

4    in. 

2 

51  in. 

2    in. 

3£  in. 

F. 

.   6    in.  .  . 

.  .  10    in.  .  . 

.   4.    in.  . 

.  .  .2.  .  . 

.  .   51  in.  .  . 

3^  in  

FF. 

.   6    in.  .  . 

.  .  10    in.  .  . 

4    in. 

a  . 

51  in. 

3J  in.    .  .  . 

J. 

.   6    in.  .  . 

.    12    in. 

4    in. 

a 

41  in. 

31  in. 

D. 

.7    in.  . 

.  .  10    in.  .  . 

.   4!  in.  . 

.  .  .2.  .  . 

.  .    6    in. 

3|  in  

CD. 

.    7    in.  . 

.  .  io£  in.  .  . 

.   4.J  in. 

a  . 

51  in. 

3£  in.    .  .  . 

DD. 

.    7    in.  . 

12    in. 

S    in. 

61  in. 

3J  in. 

41  in. 

G. 

.    7    in.  . 

.  .  12    in.  .  . 

.  .   4^  in.  . 

..•*.. 

.  .    6    in. 

2£  in.    . 

34  in.  . 

GG. 

.   7    in.  . 

,  .  14    in.    . 

.    S    in. 

a  . 

6    in. 

2  1  in. 

31  in. 

KK. 

.8    in.  .  .  . 

.  12    in. 

S    in. 

6|  in. 

2£  in. 

4    in. 

KKK. 

.   8    in.  .  . 

.  .13    in.  .  . 

.   4!  in.  . 

.  .  .2.  .  . 

.    6J  in. 

3|  in  

K. 

.8    in.  .  . 

.  .  14    in.  .  . 

S    in. 

a 

7    in. 

2£  in. 

4    in.      .  . 

LLL. 

.   9    in.  .  . 

.14!  in.  . 

.  .    si  in.  . 

.  .  3  .  . 

.  .   7|  in.  .  . 

.      2|  in.  .. 

.  .   4    in  

L. 

.  o    in.  . 

.  .  15    in.  .  . 

.    s£  in.  . 

.    a  . 

74  in. 

41  in  

LL. 

.   o    in.  . 

.  15    in.  .  . 

.    si  in. 

7|  in. 

2|  in. 

4f-  in. 

FHN. 

.   o    in. 

16    in. 

6    in. 

74  in 

3J  in 

4f  in. 

I. 

.10    in.  .  . 

.16    in.  .  . 

6£  in.  . 

2 

81  in. 

2f  in. 

5    in.  .    .  . 

II. 

.  10    in.  .  .  , 

16    in. 

6|in. 

8J  in 

3£  in. 

54-  in. 

CII. 

.  10    in.  .  .  , 

.  16!  in.  .  . 

.  .   6f  in.  . 

.     3  . 

8*  in. 

3£  in. 

5|-  in  

JJJ. 

.  10    in.  .  .  . 

.18    in.  .  . 

.  .   61  in. 

a 

8£  in. 

2£  in. 

5    in.    .  .  . 

NNN. 

.  10    in.  .  . 

.  .  19    in.    . 

61  in. 

a 

84-  in 

24  in 

5    in.    .  . 

MM. 

.  10    in.  .  . 

.  .  20    in. 

61  in. 

2 

8*  in 

24  in 

5    in. 

JJ. 

.  10}  in.  .  .  . 

18    in. 

61  in 

a 

8J  in 

34  in 

5    in. 

N. 

.  iol  in.  . 

.  lo    in.  . 

.   61  in.. 

.  .  3  .  . 

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.    34  in.  . 

.5    in.  . 

Each 

$0.50 
•SO 
•SO 
.60 
.60 
.60 

•75 
.go 

•75 
•75 
•75 
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•75 
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.00 

20 

IS 

20 
25 
50 
50 
50 
50 

75 
75 
75 

00 

15 
25 

00 

15 


(Continued  on  Page  234.) 


234 


THE  DENVER  FIRE  CLAY  COMPANY. 


MUFFLES—  Continued. 

Side 

Greatest 

Letter 

Width 

Length 

Height 

Shape 

Width 

Height 

Height 

Each 

M. 

.  iol  in. 

...  20    in.  . 

...   61  in.  . 

.  -  -3-  •  • 

.  .   8}  in.  .  . 

.  .   3£  in.  .  . 

.    5    in  

$2.25 

LM. 

.  iol  in. 

...  22    in.  . 

...   61  in.  . 

.  .  .3.  .  . 

.  .   8|  in.  .  . 

.  .   3f  in.  .  . 

.    5    in  

2.50 

III. 

.  iol  in.  , 

.  .  .  16*  in.  . 

...   6J  in.  . 

.  .  .3-  •  • 

.  .   8}  in..  . 

.  .   34  in.  .  .  . 

.    4^  in  

2.OO 

NN. 

.  ioj  in.  . 

...  19    in.  . 

...   6*  in.  . 

.  .  .3.  •  • 

.  .   81  in... 

.  .   3f  in  

.    5    in  

2.15 

RR. 

.  io£  in.  . 

.  .  .21    in.  . 

...   6*  in.  . 

.  .  .3-  •  • 

.  .    81  in.  .  . 

.  .    3|in.  .  .  . 

.    5i  in  

2.25 

BNN. 

.  iof  in.  . 

...  19     in.  . 

...   6$  in.. 

.  .  .3.  .  . 

.  .   9    in.  .  . 

.  .    3f  in.  .  . 

.    5iin  

2.25 

O. 

.11    in.. 

...15    in.. 

...   7    in.  . 

.  .  .2.  .  . 

.  .   9*  in.  .  . 

.  .   3    in.  .  . 

•    5|  in  

2.00 

00. 

.11    in.. 

.  .  .16    in.  . 

...    7    in.  . 

.  .  .3.  .  . 

.  .   9*  in.  .  . 

.  .    3    in.  .  . 

•    5|  in  

2.10 

PP. 

.11    in.. 

.  .  .  18    in.  . 

...    71  in.  . 

.  .  .3-  •  • 

.  .    9|  in.  .  . 

.  .    3*  in.  .  .  . 

.    6    in  

2.25 

P. 

.11    in.. 

...18    in.. 

...  6*  in.  . 

.  .  -3-  .  . 

.  .    9f  in.  .  . 

.  .    3f  in.  .  . 

-    6iin  

2.15 

GET. 

.11    in.. 

...  19    in.  . 

...   7    in.  . 

.  .  .3-  •  • 

.  .    9|  in.  .  . 

.   5|  in  

2.25 

PPP. 

.11    in.. 

.  .  .20    in.  . 

...   6*  in.  . 

.  .  .3.  .  . 

.  .    9f  in.  .  . 

.  .   3f  in.  .  .  . 

.    5£  in  

2.25 

R. 

.  u£  in.. 

...  19    in.  . 

...   71  in.  . 

.  .  .2.  .  . 

.  .    91  in.  .  . 

.  .  •  2*  in.  .  .  . 

.    5|  in  

2.40 

QVL. 

.12!  in. 

...  20!  in.  . 

...   7*  in.  . 

.  .  -3.  •  - 

.  .  10£  in.  .  . 

.  .   3|  in.  .  . 

.  .    5f  in  

2.50 

BQ. 

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.  .  .22*  in.  . 

...    7    in.  . 

-  .  .3-  •  • 

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.  .    4    in.  .  . 

.  .   5|  in  

2.50 

QQQ. 

.12!  in.  . 

.  .  .18    in.. 

...   7  Jin.. 

.  .  .3-  •  • 

.  .  lOfin.  .  . 

.  .   3f  in.  .  . 

.  .    6J  in  

2.50 

QQ. 

.  12!  in.  . 

.  .  .19    in.  . 

...   71  in.. 

.  .  .3.  .  . 

.  .10|  in.  .  . 

.  .   3|  in.  .  . 

.    6i  in  

2-50 

Q. 

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...  20    in.  . 

...    7*  in.  . 

.  .  .3.  .  . 

.  .  10i  in.  .  . 

.  .  3|  in.  .  . 

.  .    5f  in  

2.50 

USQQ. 

.12!  in.  , 

.  .  .21    in.  . 

...    71  in.  . 

.  .  .3.  .  . 

.  .10|  in.  .  . 

.  .   3f  in.  .  . 

.  .    6Jin  

2.50 

KQQ. 

.  I2£  in.  . 

.  .  .19    in.. 

.  .  .    7!  in.  . 

.  .  -3-  •  • 

.  .  10*  in.  .  . 

.  .   4    in.  .  . 

,  .    6    in  

2.50 

TM. 

.I2f  in. 

...  20    in.  . 

.  .  .    6f  in.. 

•  3- 

..11    in... 

.  .   3*  in.  .  . 

.  .    51  in  

2-50 

S. 

.12^  in. 

...  20    in.  . 

...   7|  in.  . 

•  3- 

.  .  lOfin.  -  . 

.  .    34  in.  .  . 

.  .    6    in  

2.50 

SS. 

.  I2|  in. 

.  .  .21    in.  . 

...   81  in.  . 

.  .  .2.  .  . 

.  .  101  in.  .  . 

.  .   3*  in.  .  . 

.  .    61  in  

2-75 

T. 

.  13    in. 

.  .  .21    in.  . 

...    71  in.  . 

.      .3- 

.  .Hi  in..  . 

.  .   3    in.  .  . 

.  .    5J  in  

2-75 

B. 

.  14    in. 

.  .  .  .2i|  in.  . 

...    7*  in.  . 

.  .  .3-  •  • 

.  .  12*  in.  .  . 

.  .    31  in.  .  . 

.  .    5|  in  

2-75 

UUU. 

.14    in. 

.  ...  19    in.  . 

.  .  .    9fin.  . 

..  .3'..  . 

.  .  121  in.  .  . 

.  .    5f  in..  . 

.  .    71  in  

2-75 

UU. 

.  14    in. 

.  ...  19    in.  . 

...    71  in.  . 

.  .  .3-  •  • 

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.  .    3*  in.  .  . 

.  .   5£  in  

2-75 

U. 

.14    in. 

.  ...18    in.. 

...   7t  in.  - 

.      .3- 

.  .11$  in..  . 

.  .   3*  in.  .  . 

.  .    5*  in  

2-75 

UA. 

.14    in. 

.  .  .  .  18    in.  . 

...   81  in.  . 

.  .  .3-  •  • 

..11|  in... 

.  .   3i  in.  .  . 

.  .    6£  in  

2-75 

PV. 

.14!  in.. 

...  23    in.  . 

...    7i  in.  . 

.  .  .3.  •  • 

.  .12*  in..  . 

.  .    4    in.  .  . 

.  .    5*  in  

3.00 

UM. 

.  14    in. 

.  .  .  .21*  in.. 

...   7*  in.  . 

.  .  .3-  .  . 

.  .12*  in..  . 

.  .    3|  in.  .  . 

.  .    5  Jin  

2-75 

V. 

.  i4i  in. 

.  ...  19    in.  . 

...   8*  in.  . 

.  .  .3.  .  . 

.  .  131  in.  .  . 

.  .    5    in.  .  . 

.  .    7    in  

2-75 

vvv. 

.14!  in. 

19!  in.. 

...    61  in.  . 

.  .  .3.  •  • 

.  .  13    in.  .  . 

.  .    31  in.  .  . 

.  .    5^  in  

3  .00 

vv. 

.14!  in. 

.  ...  19    in.  . 

...   7f  in.  . 

.  .  .3-  •  • 

.  .  13*  in.  .  . 

.  .    3f  in.  .  . 

.  .    51  in  

3.00 

TXX. 

.16    in. 

.  ...  24    in.  . 

...    9!  in.  . 

.  .  .3.  .  . 

.  .  14*  in.  .  . 

.  .    5    in.  .  . 

.  .    7^  in  

3-50 

X. 

.16    in. 

.  ...  25    in.  . 

...   72  in.  . 

.  .  .3-  •  • 

.  .  14f  in.  .  . 

.  .    4    in.  .  . 

.  .   61  in  

4.00 

XX. 

.16    in. 

.  ...  22    in.  . 

...   8*  in.  . 

.  .  .3-  .  . 

.  .  14*  in.  .  . 

.  .    4*  in.  .  . 

.  .    6}  in  

3-50 

YY. 

.17    in. 

.  .  .  .21    in.  . 

...   8*  in.  . 

.  .  .3-  •  • 

.  .  151  in.  -  - 

.  .    44  in.  .  . 

.  .    6f  in  

3  50 

TYY. 

.  20    in. 

37    in.  . 

.  .  .  10*  in.  . 

.  .  .3-  .  . 

.  .    For  Roasting  

IO.OO 

Z. 

.30    in. 

54    in.  . 

.  .  .12    in.  . 

.  .  .3.  .  . 

.  .    For  Roasting  

20.00 

SPECIAL 

MUFFLES 

FOR  THE 

CASE  GASOLINE 

FURNACES  (Patented). 

Side 

Greatest 

Letter 

Width 

Length 

Height 

Shape 

Width 

Height 

Height 

Each 

GE. 

.   6    in. 

.  .  .  .  6*    in.  . 

...   4!  in.  . 

.  .  .4.  .  . 

.  .   5    in.  .  . 

..   31  in... 

.  .  3*  in  

$0.50 

GF. 

.   6    in. 

.  .  .  .  10    in.  . 

...   4i  in.  . 

.  .  .4..  . 

.  .   5|  in.  .  . 

.  .   31  in..  . 

•  .   3fin  

•75 

GK. 

.   8    in. 

.  ...  12    in.  , 

...    51  m.. 

.  .  .4.  .  . 

..    7fin... 

..   3|in... 

.  -    4|  in  

i.iS 

01. 

.  10    in. 

.  .  .  .  16    in.  . 

...   Si  in.  . 

.  .  .4..  . 

.  .   9    in.  .  . 

.  .   3|  in.  .  . 

.  .    4*  in  

1-75 

GIL 

.  14    in. 

.  ...18    in.. 

...   6*  in.  . 

.  .  .4.  .  . 

.  .  12|  in.  .  . 

.  .   4    in.  .  . 

.  .    5    in  

2-75 

GO. 

.   6    in. 

.  .  .  .   8    in.  . 

...   3*  in-  - 

.  .  .  Spec 

...   51  in..  . 

.  .   2|  in.  .  . 

•  -    21  in  

•75 

SPECIAL 

MUFFLES 

FOR  AMERICAN  GAS  FURNACE  CO.'S 

FURNACES. 

Side 

Greatest 

Letter 

Width 

Length 

Height 

Shape 

Width 

Height 

Height 

Each 

Al. 

•   3*  in. 

Si  in.  . 

...    2%  in.  . 

.  .  .2.  .  . 

$0.50 

A2. 

.   3f  in. 

71  in.  . 

...    2*in.  . 

.  .  .2.  .  . 

•50 

A3 

.   6£  in. 

.  .  .  .10    in.  . 

...   4$  in.  . 

.  .  .2.  .  . 

•75 

A4 

,  .   7*-  in. 

.  ...  13    in.  . 

...   4$  in.  . 

.  .  .2.  .  . 

i  .20 

A5 

.11*  in. 

19  1  in.. 

...   7*  in.  . 

3.  .  . 

.  .  10    in.  .  . 

.  .   3*  in.  .  . 

.  .   6    in  

2.40 

A6 

.  .13*  in. 

iSt  in.. 

...  6|  in.  , 

3.  .  . 

.  .11|  in.  .  . 

.  .   3i  in.  .  . 

.  .   5*  in  

2.50 

A7 

.  .21    in. 

.  ...  20    in.  . 

.  .  .   74  in.  . 

-  -3-  •• 

.  .  19    in.  .  . 

.  .   3|  in... 

.  .   54  in  

4.00 

No. 

1192 

Shelf  Muffles: 

Outside  Dimensions. 

Letter 

Width 

Length 

Height 

Shape 

Each 

QA 

.  .12    in. 

.  ...  19    in.  , 

...    7$  in. 

One 

Shelf  

$3.00 

Other  sizes  made  to  order. 


THE  DENVER  FIRE  CLAY  COMPANY.  235 


SPECIAL  MUFFLES 


OUTSIDE     DIMENSIONS. 


Style 

Width 

Length 

Height 

Shape 

Each 

S-2-B    

14V2    

26       

8%    

3  

$3.50 

S-2-C    

14V2    

26       

8%    

3  

3.50 

3       

10       

16       

5%    

3  

2.00 

12       

7%   

13       

4%    

2  

1.20 

22       

7%  

13%   

4%    .... 

2  

1.20 

25       

3V2   

6       

2%.  .... 

2  

60 

27       

10       

17%    

6%    .... 

3  

2.00 

33       

ioy8  

16       

6       

4  

2.00 

34-A   

5%    

11%    

4%    .... 

2   

1.00 

34-B    

6%    

10       

4       

2   

75 

34-C    

5%    

11%   

4%    .... 

3   

1.00 

34-D   

8%    

13%   

5%  

3   

1.50 

39       

9%    

15       

5%    .... 

3   

1.75 

45       

6       

10       

4%    .... 

4   

75 

64       

17       

24%   

9%    .... 

3   

4.00 

76       

9%  

15%   

5%    .... 

3   

1.75 

77       

4%    

7%    

3%   .... 

2   

60 

80-A   

13       

21%    

7%    .... 

3   

....        2.75 

80-B    

9%    

16%  

6%    .... 

3   

2.00 

86       

11       

23       

7%    .... 

3    

2.50 

96-5    

13       

15       

6%    .... 

3   

2.50 

96-6    

8       

13%    

5%   .... 

3   

1.50 

101       

15%    

38       

9%    .... 

3    

4.00 

108-2    

4%    

67/s    

3       .... 

3    

75 

117       

......   17%    

21       

11%    .... 

2   

4.00 

118       

11%    

20       

7%  .... 

3    

2.50 

119       

ioy2  

18       

7%    .... 

3   

2.25 

119-B    

19%    .... 

15i/2    

6%  .... 

2   

3.50 

119-D   

10       .... 

18%    

6%   .... 

3   

2.00 

119-E    

9%    .... 

15%    

6%   .... 

3    

1.75 

126       

12       

18%    

7%    .... 

3   

....        2.50 

143       

14        

22        

7       .... 

3   

....        3.50 

146       

121/4      .... 

19        

7       .... 

3   

2.50 

154       

8%    .... 

15%    

5%    .... 

3   

1.50 

158-B    

12        

17%    

7       

3   

....        2.50 

158-D   

13y2    .... 

15%    

6%    .... 

3   

....        2.50 

161       

13V2    .... 

19%'  

8       

3   

....        2.75 

164       

13%    .... 

19       

8        

3   

....        2.75 

172       

21       

20       

7%    .... 

3    

....        4.00 

173       

17       ..>.. 

23       

9%  .... 

.:....  3  

4.00 

175       

141/s    .... 

21%    

8       .... 

2   

3.50 

207        

12%    .... 

20%    

7%    .... 

3   

2.75 

208       

14       

19%   

6%    .... 

3   

....        3.00 

236 


THE  DENVER  FIRE  CLAY  COMPANY. 


SPECIAL   MUFFLES 

(Continued.) 

Style 

Width 

Length 

Height 

Shape 

Each 

209       

3%   

6       

2%   

2   

....     $0.60 

213       

14%    

23i/8   

6%    

3   

3.50 

223       

12%    

15%    

6%    

3   

2.50 

235       ..... 

21%    

28       

7%    

3   

5.00 

236       

4%    

i2y8  

4       

3   

1.00 

237       

4       

10%  

3%    

3   

75 

237-A   

8%    

14%    

5%    .... 

3   

1.50 

246       

12%  

18       

7%    .... 

3   

2.50 

247       

12%    ..... 

40%    

16        

3   

6.00 

249       

8%    

10%    

5       .... 

3   

I.20 

254       ..... 

7       

19%    

5%    .... 

3   

2.00 

256       

16%    

18%    

8%    

3   

3.50 

257       

12V2    

13       

6       

3   

2.00 

262       

7%  

16       

4%    .... 

2   

1.50 

267       

13%    

19%    

17%    .... 

4   

5.00 

268       

11%  

18%    

7i/2    .... 

3   

2.50 

277       

8%  

21%    

6       .... 

3   

2.00 

279       

13       

26       

8       .... 

4   

3.00 

281       

14%    

18%    

7       

3   

3.00 

287       

9y2  

20%    

5%    .... 

3   

2.50 

288       

11%  

19%    

7%    .... 

2   

2.50 

290       

6       

17%    

4        

2   

1.50 

294       

5%   

12        

4        

3   

1.00 

296       

i7y2  

27        

8        .... 

3   

5.00 

297       

10%  

22        

6%    .... 

3   

2.50 

299       

14%    

22        

.....      8        

3   

3.50 

306       

10%   

16        

6%    .... 

3   

2.00 

308       

12%    

19        

7%  .... 

3   

2.50 

309-A   

13       

21%    

8%   .... 

3   

3.00 

309-B    

14       

21%    

8       .... 

3   

3.00 

310       

11%    

16        

7%    .... 

3   

2.25 

320       

13%    

15%    

6%    ••-. 

3   

2.50 

324       

7%    

12%    

4%    .... 

2   

1.20 

331       

6       

16       

4        

2 

1.50 

333       

i2y2  

15       

6%    .... 

3   

2.50 

334       

11     

20       

6%    .... 

3   

2.25 

335       

12%    .... 

9%    

8       

3   

2.00 

342       

24       

18       

9       .... 

3   

4.00 

343       

5%    .... 

7y8    

4%    .... 

2   

75 

344       

12       

16       

7%    .... 

3   

2.50 

348       

38       .... 

43%    

14%    .... 

3   

20.00 

351       

6       .... 

7       

4        

2   

75 

353       

8%    .... 

8%    

3%    .... 

3   

1.50 

354       

13       .... 

23y2    

7%    .... 

3   

3.00 

355       

5       .... 

11%    

3%   .... 

2   

1.00 

356       

6       .... 

12%    

4       

2   

1.00 

357 

9 

.   16 

6 

.   2   . 

1.50 

THE  DENVER  FIRE  CLAY  COMPANY. 


237 


1193-94 


1195 


No. 
1193 


1194 


1195 


1195a 


1196 


1196a 


U 
1.50 


Muffle  Arches  A,  9  inches  thick. 

Size  of  Muffles LL          I  II        NN        QQ          T 

Price,  each   $1.10       1.25      1.25      1.25       1.30       1.40 

Any  other  size  Muffle  Arch  made  to  order  at  proportionate  prices. 

Muffle  Arch  Reducer  B.  To  diminish  the  opening,  still  admitting  a  20 
gramme  Crucible  and  to  prevent  cold  air  draft  from  striking  the  muf- 
fle when  in  use. 


Size    for    Muffles... LL        I 
Price,   each    $0.40      .45 


II 
.50 


NN 
.60 


Q       QQ 
.70       .75 


SS 
.85 


Muffle  Arches  for  two-muffle  assay  furnace,  9  inches  thick. 
Set  of  two,  for  Muffles.  .  LL  I  II        NN        QQ          T 

Price,  per  set $2.20      2.40       2.50      2.50       2.60      2.80 


U     UUU       V 
.95     1.00       1.10 


U 
3.00 


Muffle  Arch  front  for  D.  F.  C.,  three-muffle,  tile-lined  furnace,  taking  NN  or 

QQ  Muffles  $3.00 

Muffle  Arch  Front,  for  D.  F.  C.  two-muffle,  tile-lined  furnaces,  size  for  LL- 

NN-QQ-UU  Muffles,  per  pair,  round  and  flat  top 2.50 

Muffle  Coolers,  of  fire  clay.     To  be  used  in  front  of  cupels.     Size,  iy8  x 

IVs  x  6 12 


1197 

1197  Muffle  Doors,  Clay. 

Size   for   Muffles   GC  GE  GF 

Price,  each $0.20  .20  .20 

Size   for   Muffles LL  NN  Q 

Price,  each $0.25  .25  .25 

1198  Muffle   Doors,  Iron. 

Size  for  Muffles LL  NN  QQ 

Price,  each $0.50  .60  .75 


1198 


GK 
.25 

QQ 
.25 


GI 
.25 

U 
.30 


GU 
.30 

TJUU 
.35 


TJ    Reducers 
1.00         .50 


238 


THE  DENVER  FIRE  CLAY  COMPANY. 


1201 


1202 


1203 


1204 


No. 

1201 

1202 

1203 

1204 


Nitrogen  Bulbs,  Arndt's,   with    4   bulbs $0.35 

Nitrogen  Bulbs,  Wills  &  Verentrapp's,  with  3  bulbs 35 

Nitrogen  Bulbs,  Volhard's,  right  angle  bulb 50 

Nitrogen  Bulbs,  Fresenius',  for  direct  titration .50 


1210 


1207 


1208 


1205  Nitrogen  Bulbs,  Troilius',  with  4  bulbs $     .50 

1206  Nitrogen   Bulbs,   Simpson's 40 

1207  Oil  Tester,  for  open  fire  test,  to  ascertain  at  what  temperature  the  coal  oil 

will  flash  or  explode.     Complete  with  standard  thermometer 7.50 

1208  Oil   Tester,   Elliott's.     Standard   of  New   York  State,   Iowa,   New   Jersey, 

Michigan,  and  in  general  use  everywhere,  with  correct  thermometer; 

arranged  for  oil  lamp   or  Bunsen  burner 8.00 

Ore  Sample  Bags,  see  No.  1215. 

1209  Pans,  of  cast  iron,  for  drying  and  roasting  ores,  Size  6  x  6  x  2^  in.  deep. ...         .50 

1210  Pans,  of  cast  iron,  with  2  handles,  for  drying  slimes  of  precipitates,  size 

18x12x6   inches 5.00 

Paper,  Litmus  and  Turmeric;  see  Test  Paper,  No.  1482. 

1211  Paper,  Black  Glazed,  for  sampling,  etc.    In  sheets  10  x  12  in.    Per  100  sheets        .60 

Per  1000  sheets       5.00 

1212  Paper,  Manila,  medium,  for  mixing  assay  samples,  best  quality,  in  sheets, 

8%  x  12  in Per  100  sheets         .20 

Per  1000  sheets       1.75 


THE  DENVER  FIRE  CLAY  COMPANY. 


239 


(Similar  to  the  Platinum  apparatus  used  by  the  United  States  Mints.) 


1213 


No. 

1213       Parting  Apparatus  of  Glass  with  Platinum  Connections. 

Consists  of  glass  cylinder  and  plate;  latter  having  six  holes  for  glass  tubes  with 
perforated  bottoms  in  which  the  cornets  are  placed.  The  cylinder  is  filled  with  acid  and 
the  plate  with  suspended  tubes  is  submerged  and  subjected  to  heat.  Washing  is  accom- 
plished by  the  removal  of  the  plate  and  tubes,  together,  from  the  acid  bath,  the  acid  in 
the  tubes  draining  through  the.perforations,  and  submerging  in  water. 

Is  convenient,  much  cheaper  than  platinum  apparatus  and  equally  as  efficient. 
Made  in  larger  sizes  to  order.  • 

Six-hole  size,  each   , $7.00 


240 


THE  DENVER  FIRE  CLAY  COMPANY. 


THE  DENVER  FIRE  CLAY  liO.1 

DENVER,       COLO. 


1215a 


1216 


1222 


1223 


No. 

1214 

1215 
1215a 

1216 


1217 

1221 

1221a 
1222 

1223 


1224 
1225 


Paper,  Parchment,  medium,  for  dialysing  and  capping;  in  sheets  24  x  36  in., 
10  sheets  to  Ib Per  Ib. 

Paper  Bags,  Manila,  for  ore  samples,  size  4%  x7  in Price,  per  1000 

Paper  Blocks,  S.  &  S.,  for  absorbing  difficult  combustible  liquids  in  calori- 
metric  determinations Price,  per  100 

Paper  Mailing  Envelope,  for  ore  samples. 

Capacity       1  2  4  6  8  oz. 

Size  3x5       3^x6         4x7         4^x8       5x9  in. 


Per  100      $0.60         0.80         1.00         1.20 


1.50 


Paper  Ore  Bag,  Excelsior,  for  mailing,  3^x5  in.  when  closed.  Is  folded 
and  gummed  in  such  a  way  that  when  sealed  it  is  absolutely  tight. 
Especially  adapted  for  mailing  finely  ground  ore  samples,  or  pow- 
dered substances Per  1000 

Pencils,  for  writing  on  glass,  china,  metal,  etc.,  blue,  red,  and  yellow.  Each 

Doz. 

Pencils,   Litmus,  see  Fig    1136 Each 


Percolators,  conical  form,  flint  glass. 
Capacity        pt.        qt. 


3  gal. 


Each 


$0.30 


.40 


.60 


.80       1.80       3.00 


Percolators,  Oldberg's,  narrow  form,  flint  glass 
Capacity    %  pt.        pt.        qt. 


3  gal. 


$0.40 
3.50 

1.75 


3.50 

.15 
1.50 

.25 


Each          $0.30         .35         .45         .70       1.10       2.00       3.00 
Picks,  prospecting.     See  Hammers,  No.  1050. 

Pipes,  pure  block  tin,  %,  %,  V2  in.  inside  dia.. . .' Per  Ib.  Mkt  pr. 

Pipes,  lead,  %,  %,  %  in.  inside  dia Per  Ib. 


THE  DENVER  FIRE  CLAY  COMPANY. 


241 


PIPETTES 


A 


25 

cc 


1232 


1233 


1234 


1235 


1236 


1238 


1240 


1234 


1235 


1236 


1237 
1238 

1238a 

1239 

1240 


Pipettes,  small;    with   rubber  bulb,  straight  end Each  $0.05;  Doz.     $0.35 

Pipettes,  small;  with  rubber  bulb,  bent  end Each       05;  Doz.         .35 

Pipettes,  with  bulb,  not  fixed. 

Capacity          5         10         25 


50       100       200  cc. 


Each 


$0.10 


.12 


.15 


.20 


.25 


Pipettes,  Volumetric;  most  accurately  graduated. 

Capacity          1        2       3        5      10      15      20 


.40 


25      50      75    100    200  cc. 


Each 


$0.10     .12     .15     .18     .20     .25     .25     .30     .40     .45     .50     .70 


Pipettes,    Mohr's;  most  accurately   graduated    in   cubic   centimeters    and 
fractions. 

Capacity  1            1          2          5         10        10        20        25        50     100  cc. 

Grad.  1-10  1-100     1-50     1-20     1-10     1-20     1-10     1-10     1-10     1-5 


Each 


$0.25       .35        .40       .45       .50       .55       .60       .70      1.00    1.50 


Pipettes,  Mohr's;  with  glass  stopcock  and  graduated. 
Capacity        10  25  50         100  cc. 

Grad.  1-10         1-10         1-10         1-5 

Each  $T25 1^50         2766 2.50 

Pipettes,  Overflow,  Rickett's;  100  cc.,  with  cup  ground  to  the  top $    2.50 

Pipettes,  Overflow,  Fresenius';   with  3-way  stopcock. 
Capacity        10  25  50         100  cc. 


Each  $2.25  2.50  2.75  3.00 

Pipettes,  Assay  Ton,  29.166  cc Each 

Pipettes,   Sucrose,   52.096   cc Each 

Pipette   Rests,  of  porcelain,  fluted Each 


.60 

1.50 

.65 


242  THE  DENVER  FIRE  CLAY  COMPANY. 


CLEANING  PLATINUM  WARE 

Every  careful  analyst  uses  clean  utensils.  A  habit  of  cleaning  and  polishing 
platinum  dishes  immediately  after  using  is  easily  formed,  and  repays  the  user  with 
increased  confidence  in  his  work  as  well  as  in  the  prolonged  life  of  the  article. 

Rubbing  the  surface  of  platinum  with  moist  sea  sand  (round  grains  only),  applied 
with  the  fingers,  serves  to  remove  most  impurities  and  to  polish  the  metal  without 
material  loss. 

Fusing  bisulphate  of  potash  or  borax  in  the  dish  and  then  boiling  in  water  and 
polishing  as  above  with  sand  is  recommended  by  Gmelin.  When  it  is  desired  to  clean 
the  outer  surface  of  dishes  in  this  manner,  they  must  be  placed  in  dishes  of  sufficient 
size  to  allow  the  fused  flux  to  completely  envelope  the  article  to  be  cleaned. 

Sodium  amalgam  possesses  the  property  of  wetting  the  platinum  without  amalga- 
mating with  it,  even  when  other  metals  are  purposely  added  to  the  amalgam.  This  sub- 
stance is  therefore  useful  for  effecting  a  quick  and  thorough  cleansing  of  the  platinum. 
The  amalgam  is  gently  rubbed  upon  the  metal  with  a  cloth  and  then  moistened  with 
water,  which  oxidizes  the  sodium  and  leaves  the  mercury  free  to  alloy  with  foreign 
metals.  The  mercury  is  then  wiped  off  and  the  dish  cleaned  and  polished  with  sand, 
as  above  described. 

If  the  existence  of  a  base  metal  alloyed  with  the  platinum  is  suspected,  immerse 
the  article  first  in  boiling  muriatic  acid  for  a  few  minutes;  then,  after  thorough  rinsing 
with  clean  water,  immerse  in  boiling  nitric  acid  free  from  chlorine.  If  the  dish  is  unaf- 
fected in  weight  or  appearance,  and  the  acid  bath  fails  to  give  reaction  for  the  base 
metals,  their  absence  in  appreciable  quantities  is  assured. 


Notes  upon  the  Use  and  Care  of 
Platinum  Ware 

It  is  important  to  remember  that,  although  platinum  is  not  oxidized  in  the  air 
at  any  temperature,  nor  attacked  by  any  single  acid,  yet  there  are  many  substances 
that  attack  and  combine  with  it  at  comparatively  low  temperatures. 

The  caustic  alkalies,  the  alkaline  earths,  nitrates  and  cyanides,  and  especially 
the  hydrates  of  barium  and  lithium,  attack  platinum  at  a  red  heat,  although  the  alkaline 
carbonates  have  no  effect  at  the  highest  temperatures.  Sulphur,  in  the  absence  of  alka- 
lies, has  no  action,  but  phosphorus  and  arsenic  attack  platinum  when  heated  with  it. 

Direct  contact  of  platinum  with  burning  charcoal  should  be  avoided,  since  the 
silicon  reduced  from  the  charcoal  ash  unites  with  platinum,  making  it  brittle  and  liable 
to  fracture. 

Also  contact  with  compounds  of  the  easily  reducible  metals  is  especially  danger- 
ous at  high  temperatures,  as  alloys  with  platinum  having  a  low  fusing  point  are  readily 
formed.  This  is  especially  true  of  lead. 

Heating  of  platinum  with  spirit  lamps  is  preferable  to  the  use  of  ordinary  gas. 
When  gas  is  used,  care  should  be  taken  to  have  the  supply  of  air  sufficient  to  insure 
complete  combustion,  since,  with  the  flame  containing  free  carbon,  the  platinum  suffers 
deterioration  by  the  formation  of  a  carbide  of  platinum,  which,  oxidizing  later,  blisters 
the  metal.  For  this  reason,  also,  the  inner  cone  or  reducing  flame  should  not  be  in 
contact  with  the  metal. 

The  loosening  effect  of  the  Bunsen  flame  upon  the  surface  of  platinum  exposed 
to  its  action  produces  the  familiar  gray  appearance  which  cannot  be  removed  except 
by  burnishing.  Platinum  triangles  often  become  gray  and  very  brittle  from  the  same 
cause.  Systematic  application  of  moist  sand  to  all  articles  affected  in  this  way,  after 
use,  will  keep  them  in  prime  condition  and  materially  prolong  their  life,  with  but  a 
trifling  loss  in  weight. 


THE  DENVER  FIRE  CLAY  COMPANY. 


243 


PLATINUM 


1252 


1253 


1254 


1255 


Our  platinum  ware  is  warranted  pure  and  of  superior  make  and  shape.  All 
crucibles  and  dishes  are  hammered.  We  also  make  to  order  any  special  apparatus. 
The  weights  given  are  approximate  only. 

We  are  unable  to  quote  definite  prices,  but  we  will  make  the  very  lowest  figures 
consistent  with  the  market  value  of  platinum  metal. 


No. 

1251 


1252 


1253 


1254 


1255 


Old  or  scrap  Platinum  bought  at  market  price. 

Platinum  Boats;  for  combustion  in  organic  analysis,  plain  form. 
Size  2  2V2  3  in. 


Weight        5                    6y2 

Platinum   Boats,  with   handles. 
Size          21/2                        3 

Sy2  grms. 
31/2  in. 

Weight         6 


9  grms. 


Platinum  Capsules;  flat  bottom,  corners  rounded. 
No.  0  1  2 


Dia. 
Height 


1% 


1% 
1 


2  in. 
1%  in. 


Weight         5  10  25  grms. 

Platinum  Cones.    For  filtering  with  vacuum  pump;  made  solid  in  one  piece. 
Dia.  at  top      %  1  1%  iy2  2  in. 

Weight  2  3  4  7  10  grms. 

Platinum  Cone  and  Spiral,  according  to  Fresenius,  for  the  quantitative 
determination  of  copper,  etc.,  by  galvanic  current.  Weight,  15  to  25 
grammes  each. 

Support  for  same,  see  No.  1470. 


244 


THE  DENVER  FIRE  CLAY  COMPANY. 


No. 
1257 


Capacity  10 
Weight     10 

15 

15 

20 

20 

25 
25 

30 
30 

40 
40 

50  cc. 

50  grms. 

1257 

Platinum   Crucibles;   with  covers,  best  hammered  ware. 
No.  1234 


1258 


I258a 


1259 


1260 


1259 


Platinum  Crucibles,  Gooch's  Form;  with  or  without  covers. 
No.  123 

Capacity  20          25          30  cc. 
Weight     25          30          37  grms. 
Platinum  Crucibles,  Lawrence  Smith's  form  for  mineral  analysis, 

weight,  35  grammes. 
Platinum  Cylinder  and  Spiral,  for  quantitative  determination  of 

copper  by  electrolysis,  cylinder  2x1  in.,  wt.  about  20  grms. 
Platinum  Dishes,  with  lip,  best  hammered  ware.     For  full  sizes, 

see  Fig.  1260,  page  245. 
No.  123456789 


Weight      150 
Dia.  120 

Capacity  400 


125 
110 
325 


90 
100 
250 


65 

90 

200 


48 

80 

130 


32 
70 
70 


22 
60 

45 


14  8  grms. 

50        40  mm. 
30         13  cc. 


1261 

Platinum  Dishes;  for  incineration  of  filters,  square. 
No.  1  2 

Dia.          1% 


Weight     10 


2  in. 
20  grms. 


THE  DENVER  FIRE  CLAY  COMPANY. 


245 


1260 


1267 


1262 


1264 


1268 


No. 

1262 


1263 
1264 

1265 


1266 
1267 
1268 
1269 


Platinum  Dishes;  for  milk  analysis,  flat  bottom. 
No.  1  2 


Dia. 
Height 


50 
19 


56  mm. 
25  mm. 


Weight       14  17  grms. 

Platinum  Dishes,  for  sugar  analysis;  shallow,  with  rounded  bottom 

Platinum   Filter   Boats  and   Holders,  as  used  in  iron  and  steel  analysis; 
weight  of  boat  about  15  grammes;   weight  of  boat  holder  about  23 

grammes   

Platinum    Foil   

Size  Light        Medium  Heavy. 


Thickness 


1-1000 


1-500 


1-250  in. 


1.411  grammes. 


Weight  per  square  inch     0.353  0.705 

Platinum  Gauze,    fine 

Platinum  Spatulas,  length  3  and  4  inches;   weight  4  to  8  grammes. 

Platinum  Sponges,   wired   for   hydrogen    ignition 

Platinum  Spoons,   without  lid 

No.  1 2 3 

Dia.         10 


13 


^ 

Weight  1.5 


16  mm. 
3.0  grms. 


246 


THE  DENVER  FIRE  CLAY  COMPANY. 


No. 

1270 


1271 


1270 

Platinum  Spoons,  with  lid,  for  blow  pipe  analysis. 
No.  1234 


1271 


Dia. 


10 


13 


16 


19  mm. 


Weight  2.5          3.0          4.0          5.0  grins. 

Platinum  Triangles,  made  of  Nos.  16  and  15  wire,  very  substantial. 
For  crucibles  10  15  20  25  cc. 


Wt.  about          8 
For  Crucibles  30 


10 
40 


12 
50  cc. 


14  grms. 


1272 
1273 


Wt.  about          16  18  20  grms. 

Platinum  tips,  for  blow  pipes,  of  correct 
Platinum    Wire 

No. 


' 

12 

14 

16 

18 

20 

22 

24 

per  in. 

1.8 

1.1 

.7 

.45 

.28 

.17 

.12  grms. 

26 

27 

30 

34 

35 

36 

1274 


No. 

Wt.  per  ft.         .85  .65  .33         .132         .101        .08  grms. 

Platinum  Apparatus  of  any  special  kind  or  shape  furnished.     Prices  given 
upon  application. 


1281 


1282 


1283 


1284 


1281  Pliers,  "Button,"  straight,  for  holding  buttons  while  brushing;  5  in $0.40 

1282  Pliers,  "Button,"  turned-down   nose,  for  holding  buttons  while  brushing; 

5    in .50 

1283  Pliers,    flat    nose,    steel    faced 5  in.  $0.30;  6  in.  .40 

1283a     Pliers,  round  nose,  steel  faced 5  in.      .30;  6  in.  .40 

1284  Pliers,  diagonal   cutting,  nippers  steel 5  in.      .75;  6  in.  .85 


THE  DENVER  FIRE  CLAY  COMPANY. 


247 


1285 


1286 


1289 


1290 


No. 

1285 
1286 
1287 
1289 

1290 


Pliers,  end  cutting,  nippers  steel 5  in.  $0.75;  6  in.  $0.85 

Pliers,    side    cutting,   steel Sin.     .75;  6  in.  .85 

Pliers,  Gas,  8  inches . Each  .50 

Pliers,  Plattner's,  side  cutting,  nippers,  nickel-plated,  for  breaking  off  small 

pieces  from  the  minerals  to  be  tested 1.00 

Pokers,  of  iron,  for  furnaces Each  .50 


1291 


1293 


1291  Potash  Bulbs,  Liebig's,  with  5  bulbs $0.50 

1292  Potash  Bulbs,  Liebig-Dittmar's   75 

1293  Potash   Bulbs,  Liebig-Kyll's   .75 


248 


THE  DENVER  FIRE  CLAY  COMPANY. 


1294 


1297 


1298a 


1298b 


1299 


1300 


No. 

1294 

1295 

1296 

1297 

1298 

1298a 

1298b 


1299 


Potash  Bulbs,  Geissler's,  plain $0.85 

Potash  Bulbs,  Geissler's,  with  CaCl2  tube  attached   1-00 

Potash  Bulbs,  Geissler's,  with  CaCl2  tube  attached  by  ground  joint 1.50 

Potash  Bulbs,  Winkler's,  spiral,  medium  size   1-25 

Potash  Bulbs,  Winkler-Kyll's    1-50 

Potash   Bulbs,  Mitcherlich's    50 

Press,  for  pressing  herbs,  meat,  etc.     This  is  the  only  press  made  having 

a    wrought-iron    screw,    machine-cut    thread,    working    in    a    copper 

socket,  to  prevent  rusting  up. 

Quart   3.50 

%   gallon    4.50 

1  «        7.00 

2  "        10.00 

Pulverizers  or  Mills,  for  grinding  grain,  soft  ores,  bones,  etc. 
Size  No.  235 

Height        12^  15  17  in. 


9.00 


Each          $4.00  6.00 

1300       Pyrometer,  Gauntlett  System,  reading  up  to  1500°  F. 

5-inch  dial,  $26.00;  7-inch  dial 


30.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


249 


1300a 


1300b 


No. 

1300a     Pyrometer,  Electrical  or  Hoskins'  Heat  Gage,  well  recommended  by  many 

users,  guaranteed  accurate  up  to  temperatures  of  1400°  C.  or  2550°  F. 
Price  of  complete  Heat  Gage  or  Pyrometer  with  one  36"  Hot  End  and  20 

ft.    copper    leads $50.00 

Extra  Hot  End   (36"  long)    complete  with  Handle,  Adjusting  Resistance, 

and  20  ft.  of  cable 7.50 

Hot  ends  can  be  supplied  any  length,  but  the  standard  is  about  36" 
long.  For  each  additional  foot  of  Hot  End  add  $1.50. 

In  ordering  be  sure  and  state  whether  a  Fahrenheit  or  Centigrade 
scale  is  wanted.  Also  the  length  of  copper  leads  necessary  to  connect  the 
Hot  End  to  the  Pyrometer,  if  the  distance  is  greater  than  20  feet. 

1300b  Pyrometer,  Heraeus-Le  Chatelier  for  measuring  temperature  between  0 
and  1600°  C.,  including  Galvanometer,  Standard  Heraeus  Element  (two1 
60  in.  lengths  joined),  with  certificate,  and  one  each  outside  and 

inside  high  temperature  porcelain  protection  tubes 1 50.00 

Ditto,  but  with  shorter  Heraeus  Element  (two  18  in.  lengths  joined),  with 

certificate ;   and  corresponding  porcelain  tubes 1 15.00 

Ditto,  with  shorter  Heraeus  Element  (two  12  in.  lengths  joined),  without 

certificate,  and  with  corresponding  porcelain  tubes 100.00 

Note: — The  Heraeus  Elements  can  be  replaced  at  any  time  as  they 
are  interchangeable,  and  all  other  parts  are  sold  separately,  at  the  follow- 
ing prices: 

Galvanometer     75.00 

Standard  Heraeus  Element,  two  60  in.  lengths,  with  certificate 60.00 

Heraeus  Element,  two  18  in.  lengths,  with  certificate 31.50 

Heraeus  Element,  two  12  in.  lengths,  without  certificate 20.00 


250 


THE  DENVER  FIRE  CLAY  COMPANY. 


Pyrometer,  Le  Chatelier's,  Portable 


1300c 
No   Levelling.     Automatic  Coil    Lock. 

Built  in  Hard  Rubber  and  Teak  Wood  Case. 


No. 

1300c  Here  is  at  last  a  practical  sensitive  and  accurate  form  of  the  world 
famous  Le  Chatelier  Pyrometer.  It  is  truly  portable,  for  you  have 
only  to  set  it  down  anywhere  and  open  the  lid.  Not  bothered  by 
vibrations.  3000°  F.  or  1600°  C. 

Portable  Indicator  as  illustrated   $80.00 

60-inch  Platinum,  Rhodium-platinum  Thermocouple,  which  can  be  exactly 

duplicated  at  any  time 40.00 

48-inch  set  of  Outside  and  Inside  Pyrometer  Tubes  of  Electroquartz 7.00 


$127.00 


Thermocouples  are  interchangeable  and  can  be  supplied  of  any  length, 
per  foot,  $8.00. 


THE  DENVER  FIRE  CLAY  COMPANY. 


251 


Pyrometer,  Electrical,  " Advance" 


1800°  F. 


ISOOd 


1000°  C. 


No. 

ISOOd 


This  indicator  has  the  largest  and  most  easily  read  scale  of  any 
Pyrometer  sold  in  Europe  or  America.  Dial  is  10  inches  in  diameter. 
Solid  brass  dust-proof  case,  beveled  plate  glass  front.  It  is  a  wall 
pattern  indicator,  not  affected  by  even  severe  vibrations.  Operates 
with  any  one  or  any  number  of  advance  Fire-rods  of  any  length  and 
near  or  far  from  the  furnaces. 

over  two  years  in  use  on  Annealing,  Hardening,  Tempering  and 
Blast  Furnaces,  and  in  such  work  as  galvanizing,  chemical  manufac- 
ture, flue  temperature  measurement,  etc. 

PRICE. 

Form    "A"    Indicator $60.00 

36-inch  Fire-rod  4.00 

Connection  Head    .  .75 


For 


$64.75 

Connecting  wires  extra,  as  needed. 

Fire-rods  up  to  and  including  the  72-inch  length  are   y2  inch  outer 
diameter.    The  91-inch  rods  are  %  inch  outer  diameter. 
Fire-rods :  PRICES. 

36   in.   long $4.00 

48    in.    long 5.00 

64    in.    long 6.50 

72   in.    long 7.50 

91  in.   long 9.50 

Connection  head  for  Fire-rod  (for  connecting  the  wires  to  any  rod) .75 

Hard  rubber  handle  containing  cold-junction  thermometer  for  work  of  ex- 
treme accuracy   5.00 

Adjustable  disc  for  Fire-rod  .60 


252 


THE  DENVER  FIRE  CLAY  COMPANY. 


SEGER  PYROMETER  CONES 


1300e     Pyrometer  Cones,  Seger's  Imported,  for  use  in  the  ceramic  industry  ranging  from 
590°  to  1910°  Centigrade. 


Table  showing  temperatures  at  which  the  cones  begin  to  melt,  viz. 


Segercone 

Temper. 

Segercone 

Temper. 

Segercone 

Temper. 

Number 

Centig. 

Number 

Centig. 

Number 

Centig. 

022  

590° 

01  

.  ...  1130° 

21  

.  ..  1550° 

021  

620° 

1  

.  ...  1150° 

22  

...  1570° 

020  

650° 

2  

1170° 

23  

.  ..  1590° 

019  

680° 

3  

.  ...  1190° 

24  

...  1610° 

018  ....... 

710° 

4  

.  .  .  .  1210° 

25  

...  1630° 

017  

740° 

5  

.  ...  1230° 

26  

...  1650° 

016  

770° 

6  

.  ...  1250° 

27  

...  1670° 

015  

800° 

7  

.  ...  1270° 

28  

...  1690° 

014  

830° 

8  

1290° 

29  

...  1710° 

013  

860° 

9  

1310° 

30  

...  1730° 

012  

890° 

10  

.  .  .  .  1330° 

31  

...  1750° 

Oil  

920° 

11  

.  .  .  .  1350° 

32  

.  .  .  1770° 

010  

950° 

12  

.  ...  1370° 

33  

...  1790° 

09  

970° 

13  

1390° 

34  

...  1810° 

08  

990° 

14  

1410° 

35  

.  .  .  1830° 

07  

1010° 

15  

1430° 

36  

...  1850° 

06  

1030° 

16  

.  .  .  .  1450° 

37  

...  1870° 

05  

1050° 

17  

1470° 

38  

...  1890° 

04  

1070° 

18  

.  .  .  .  1490° 

39  

...  1910° 

03  

1090° 

19  

1510° 

02  

1110° 

20  

1530° 

These  cones  are  sold  in  single  numbers  packed  in  boxes  of  100  cones  each, 
and  also  in  assorted  numbers,  any  quantity,  as  required. 

Price  per  100  net $3.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


253 


1301 


1305  1306 


1307-8 


1309 


No. 
1301 

1302 
1303 
1304 
1305 
1306 
1307 
1308 
1309 


Respirators,  Cover's  patent.  The  most  complete  device  ever  offered  for 
protecting  the  lungs  and  throat  from  dust,  poisonous  gases  and  all 
other  impurities  $2.00 

Receivers,  Florentine.     For  collecting  distillates. 
Capacity  1  pt.       1  qt.  y2  gal. 

Each 


$0.50        .60 


1.00 


Receivers  for  retorts.     Glass,  plain. 
Capacity        4  8          16 

Each 


32  oz. 


$0.15 


.20 


.25 


.30 


Receivers  for  retorts.    Glass,  with  tubulature  and  glass  stopper. 
Capacity         4  8  16  32  oz. 


Each         $0.25 

.35 

.50 

.60 

Receivers  with  two  tubulations. 
Capacity        8          16 

32  oz. 

Each         $0.40 

.50 

.60 

Receivers  with  three  tubulations. 
Capacity        8          16 

32  oz. 

Each         $0.50 

.60 

.80 

Retort  Adapters,  straight. 
Wide  End  Vz 

l       : 

iy2 

2  in. 

dia. 

Each         $0.15 

.20 

.30 

.40 

Retort  Adapters,  bent. 
Wide  End  % 

1 

iy2 

2  in. 

dia. 

Each        $0.15 

.20 

.30 

.40 

Rests  for  Bottles,  to  put  under  bottles  containing  acids,  etc.,  for  protecting 
table;  of  porcelain,  30c;  of  hard  rubber,  25c. 


254 


THE  DENVER  FIRE  CLAY  COMPANY. 


No. 
1311 


1312 


1311 

Retorts,  Bohemian   glass,  plain. 

Capacity         2  4 

Each 


16 


$0.12 


.15 


.22 


.28 


.50 


.75 


Retorts,  Bohemian  glass,  with  tubulature  and  glass  stopper. 
Capacity         2  4  8  16  32  oz.     % 

Each         $0.20          125          [35 A5          160 M 


2  gal. 


1.25        2.50 


1313 


1313  Retorts,  with  ground  in  receiver,  glass  stoppered. 

Capacity        4  8          16  oz. 

Each         $0.75        UK)        1^50 

1314  Retorts,  porcelain,  with  tubulature  and  stopper. 

Capacity         4  8  16  oz. 

Each        $1.25        TT50        175 


1314 


1314a 


1315 


1314a     Retorts,    Royal    Berlin    porcelain,   with    detachable    hood,    5-gallon    capac- 
ity   Each  $40.00 

1315       Retorts,  copper.     For  generating  oxygen;   with  iron  clamp  and  brass  de- 
livery tube. 

Capacity         %  pt.  1  pt.  1  qt.  Vz  gal. 

Each  $2^25 275  3^25 375 


THE  DENVER  FIRE  CLAY  COMPANY. 


255 


1315a 


1315b 


No. 

1315a     Retorts,  iron.    For  generating  oxygen;  dimensions  11  inches  deep,  7  inches 

diameter.     Cover  is  turned  and  fitted  with  asbestos  packing. 
Price $5.00 


1315b     Retorts,  of  Iron,  cylindrical  form,  for  gradually  generating  oxygen,  3^x22 
inches. 

Price 

Folding  support  for  same.     Price 


3.00 
1.00 


1316 


1316a 


1317 


1316 


1316a 


Retorts,  iron.     For  mercury  distillation,  etc.;   movable  cover  fastened  by 
screw  clamp  and  milled  smooth,  making  it  absolutely  tight  fitting. 
Capacity  %  pt.       1  pt.       1  qt.          %          1  2  gal. 

Each  $2^50       2J5       3^25        4^)0        6^00        8.00 

Retorts,  Nevada  or  oval  top,  complete,  with  iron  delivery  pipe. 
Capacity  3  4  5  6          10  pts. 


Holds  Quicksilver 
Weight 

Price 


38 
18 


50 
25 


63 
30 


75 
44 


125  Ibs. 
65  Ibs. 


$7.00        8.00        9.00      10.50      12.00 

Note: — For  use  with  the  above  retorts  we  can  furnish  our  furnaces, 
Catalogue  No.  980,  fitted  with  necessary  Retort  Plate  to  hold  retort. 

1317       Rings.     Of  porcelain,  concentric,  for  water  baths,  etc. 
In  sets  of  567 

Dia.  of  largest         16*          20  25  cm. 

Set  $1.00       T50        2.00 


1321       Roasting  Dishes;  of  clay,  very  shallow,  our  own  manufacture. 
Dia.  2V2  3  4  5  6  in. 

Doz.         $0.70          180 ^0        TTlO        1.75 


256 


THE  DENVER  FIRE  CLAY  COMPANY. 


1322 


1323 


No. 

1322 


Rolling   Mills;   for  metals, 
rolls. 

No.  2 


Improved  single  geared  hand  mills,  with  flat 


Size  of  rolls  2x1% 
Weight  80 


3x2% 
145 


4x2%  in. 
190  Ibs. 


1323 


Each.net       $30.00         50.00        75.00 

Rolling   Mills,  for  metals.     Improved  double  geared  hand  mills,  -with  flat 
rolls. 

No.  3  4 


Size  of  rolls  3x2% 
Weight  180 


4x2%  in. 
225  Ibs. 


Bach,  net        $75.00        100.00 

Note: — The  above  hand  rolling  mills  for  assayers  are  mounted  upon 
cast  iron  column.  The  rolls  are  evenly  tempered,  truly  ground, 
finished  with  a  high  polish,  and  are  fully  warranted.  The  gears 
are  all  cut,  cranks  of  steel,  boxes  of  bronze,  and  the  pressure  screws 
of  steel,  with  the  points  tempered. 


THE  DENVER  FIRE  CLAY  COMPANY. 


257 


1331 


1332 


1333 


1335 


No. 

1328       Rubber  Aprons,  36.  in  wide,  50  in.  long $0.75 

1330  Rubber  Sleeves  Pair         .40 

1331  Rubber  Bulbs,  for  pipettes,  etc. 

Capacity        2 5          10          25          5j)  cc. 

Each        $O05 M         JO          ^20 [25 

1332  Rubber  Bulbs,  with  valve  for  wash  bottles,  etc.     Capacity  50  cc 40 

1333  Rubber  Bulbs,  or  Hand  Bellows,  with  valve;  two  bulbs  for  use  with  blow 

pipes,  etc.,  giving  a  continuous  blast Each  1.00 

1333a  Rubber  Bulb,  with  flexible  tube,  for  Orsat's  apparatus Each  .40 

1333b  Rubber  Bulb,  double  acting,  for  Orsat's  apparatus,  to  take  gas  samples 

"Rubber  Aspirator" 2.00 

1334  Rubber  Sheeting,  pure  gurn,  unvulcanized,  in  rolls,  3  feet  wide.     Light, 

medium  and  heavy Ib .       4.00 

1335  Rubber  Pads.    Of  pure  gum  %  in.  thick,  for  dressing  amalgamating  copper 

plates. 

Size        4x6         6  x  6  in. 
Each       $TOO •L25~ 

1336  Rubber  Stoppers.   These  are  made  of  pure  Para  Gum,  and  not  having  any 

adulteration,  they  will  float  on  water Oz.  $0.25;    Ib.      3.50 

No.  Large  End.  Small  End.  No.  to  Lb. 

00 14  mm 10  mm 180 

0 15  mm 11  mm 120 

1 18  mm 14  mm 90 

2 20  mm 16  mm 80 

3 23  mm 19  mm 60 

4 25  mm 20  mm 50 

5 27  mm 23  mm 40 

6 32  mm 26  mm 30 

7 36  mm 30  mm 22 

8 40  mm 34  mm 18 

9 44  mm 36  mm 15 

10 50  mm 41  mm 11 

11 55  mm 50  mm 9 

12 62  mm 54  mm 6 

13 68mm 57mm..  5 


1337 

1338 
1339 

1340 


1337-38 


1339 


1340 


Rubber  Sheeting,  vulcanized  on  muslin.     White,  for  mixing  ore  samples; 

rolls  36  in.  wide  Yard  $0.75 

Rubber  Sheeting.  Same  as  above,  black Yard  .7b 

Rubber  Stirrers,  point  a  flexible  cone.  For  washing  down  Ba(OH)2,  etc., 

from  walls  of  beakers,  etc .25 

Rubber  Tips,  s.  c.  "Policemen."  To  be  attached  to  glass  rod,  for  scraping 

precipitates  from  walls  of  beakers Doz.         .50 


258 


THE  DENVER  FIRE  CLAY  COMPANY. 


RUBBER  TUBING 


No. 

1341 


1342 


1343 


1344 


1345 


1345a 


1346 


1347 


1348 
1349 
1350 


Rubber  Tubing,  black,  pure  gum,  light  wall. 
Inside  dia.     %        5-32        3-16  y4 

Foot 


5-16 


%  in. 


$0.05 


.07 


.10 


.12 


.14 


.20 


.30 


Rubber  Tubing,  black,  pure  gum,  heavy  wall. 
Inside  dia.     %        3-16  14        5-16 

Foot 


$0.06 


.12 


.15 


.20 


.30 


.40 


Rubber  Tubing,  red  or  antimony.    Best  quality. 
Inside  dia.     %        3-16          1,4        5-16 
Foot 


in. 


$0.05 


.10 


.12 


.15 


.20 


.25 


Rubber  Tubing,  band,  pure  gum,  light  walls.     For  Gooch  crucibles. 
W4dth,  flat      1*       11,4         1V2         1%  in. 
Foot 


$0.15 


.20 


.25 


.30 


Rubber  Tubing,  white,  heavy  wall.    Best  quality,  hand-made,  for  conducting 
gas,  etc.;   in  12-foot  lengths. 

Inside  dia.     %        3-16  %        5-16          %  y2  %  %  i 

Foot 


$0.06 


.10 


.12 


.15 


.20 


.25 


.30 


.40 


Rubber  Tubing,   white,    light  wall,    hand-made.     For   connections. 
Inside  dia.     %        3-16  ^4        5-16  %  y2  in. 

Foot 


$0.05 


.07 


.10 


.12 


.15 


.20 


Rubber  Tubing,  white  cloth  insertion,  heavy  wall. 
Inside  dia.     14  %  in. 

Foot 


$0.15 


.20 


Rubber  Tubing,  extra  heavy  walls.     For  vacuum  pumps,  etc. 
Inside  dia.     %        3-16  14  %  in. 

Foot 


$0.10 


.15 


.25 


.40 


Rules,  of  boxwood,  30  cm.  and  12  inches $0.20 

Rules,  of  boxwood,  60  cm.  and  24  inches,  four-fold 40 

Rules,  Meter  Sticks,  1  meter  on  one  side  in  millimeters,  and  39  inches  in 

one-eighths  on  the  other .40 


1350a 

]350a     Sampler  for  concentrates  or  sand,  etc. 

Size  12  18  24  30          36  in. 


Each     $1.50        1.75        2.00        7.00 
30  and  36-inch  have  T  handles. 


8.00 


1351 


No.  1351  Samplers,  "Jones  Ore  Sampler." 
Its  construction  facilitates  quick  and  even 
sampling.  It  consists  of  hopper  set  in  4-legged 
support,  scoop,  and  4  sampling  pans  and  brush. 
All  parts  can  be  easily  cleaned.  It  is  made  in 
4  sizes. 

Size      4x!4       6x6      8x10      10  x  18  in. 

Trays      V2  %          %  1  in. 

Each     $8.00      10.00      15.00         25.00 
Extra  Brushes  for  same,  Each,  $0.30;  Doz.,  $3.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


259 


Case  Improved  Sampler 


1351a 
Code  Word,  "Casesam." 


No. 

1351a     Sampler,  "Case  Improved." 

The  advantageous  features  of  this  sampler  over  others  of  similar  pattern  are 
apparent  from  the  above  illustration. 

The  short  division  channels,  which  are  accurately  cut  to  an  angle  of  60°,  makes 
it  extremely  simple  to  quickly  and  thoroughly  clean;  and  the  pan  stop,  through  the 
center  between  the  divisions,  adds  greatly  to  the  rapidity  with  which  the  work  of  cutting 
down  samples  can  be  accomplished. 

It  is  substantially  constructed,  and  the  handiest,  most  convenient  and  accurate 
sampler  yet  devised  for  hand  manipulation. 
Price,  with  four  pans  and  scoop: 

Size  4x4  6x6  8x10  in. 

Trays  %  %  % 


Each 


$8.00 


10.00 


15.00 


260 


THE  DENVER  FIRE  CLAY  COMPANY. 


1352 

No. 

1352       Sampler  and  Scoop.     Trays  y2  in.  wide. 

Size  6x6  9x9         12x12  in. 


1353 
1354 

1355 


Each 
Samplers  only 
ScoopS  only.  . 

Sampling  Bags. 
Size 

$1.50 
$1.00 
$0.50 

Of  duck, 
6x10 

2.50 
1.75 
.75 

for  ore, 
6x14 

3.00 
2.10 
.90 

as  used 
9x15 

by  mills,  etc. 
10x21  in. 

Doz. 

$0.50 

.75 

1.25 

1.50 

1356 


Sampling  Bags,  of  Paper;  see  No.  1215. 

Sampling    Drill,   for   drilling   small    samples   of   metals   from   bullion    for 

assaying.    It  is  26  in.  high  and  weighs  29  Ibs.;  neatly  japanned $10.00 


1357 


1357a 


1358 


1359 


1357       Sampling  Pans.    For  ore  samples,  of  seamless  tin. 

Dia  5  6  7  8  10  in. 

Doz.         $0.35          .40          .50          .70          .90 


1357a     Sampling  Pans,  for  ore  samples,  of  enameled  steel. 
Dia.  514  6        6%         7%          10  in. 


1358 
1359 


Each 
Doz. 


$0.15 
1.50 


.20 
2.00 


.25 
2.50 


.30 
3.00 


.35 
3.50 


Sampling  and  Mixing  Horn.   Bowl  Sxl1^  in.  at  largest  dia..Each  .30;  Doz.     $3.00 
Sampling  and  Amalgamating  Scoop.    Russia  iron,  5  x  4^  in 40 


THE  DENVER  FIRE  CLAY  COMPANY. 


261 


1361 


Sampling  Scoops.     Horn. 
No.  1 

Bowl          3^4x2% 
Doz. 


3%x2% 


1361 


1362 


$1.25  1.60 

Sand   Baths.     Sheet  iron,  shallow. 
Dia.  345 


Each    $0.15 


.20 


.25 


.45 


1362 


2.25 


10  in. 


Each     $0.10          .12          .15          .20          .30 
Sand  Baths.    Sheet  iron,  hemispherical. 

Dia.  4  5  6  8  10  in. 


.50 


.70 


1363 

1363       Sand  Baths,  or  Hot  Plate,  an  iron  tray  on  4  legs. 
Size         6x8        8x10      10x12  in. 


1364 


1364 


Each     $2.00  2.25  2.50 

Sand  Baths,  Ruedorff's,  of  wrought  iron  with  adjustable  burner,  8  x  10  in.. . 


$7.00 


262 


THE  DENVER  FIRE  CLAY  COMPANY. 


SCORIFIERS 

Our  Own  Manufacture — Guaranteed. 


1365 


The  Scorifiers  manufactured  by  The  Denver  Fire  Clay  Company  aro  one  of  our 
extremely  high  grade  specialties,  and  are  sold  under  our  positive  guarantee  to  be  the 
best  in  the  world. 

The  mixture  entering  their  composition  is  the  product  of  many  years  of  careful 
experiments,  and  is  such  as  to  admit  of  no  lead  or  other  metallic  absorption;  will  not 
crack  in  process  and  will  not  pit  or  leave  any  opening  for  retention  of  lead  after 
completion  of  its  work. 

They  are  made  in  two  shapes,  known  as  the  Regular  and  Bartlett  styles,  the 
latter  being  shallower  and  recommended  for  the  scoriflcation  of  heavy  sulphide  ores. 
Neither  is  the  result  of  hasty  conclusions,  but  designed  with  due  regard  to  the  laws 
upon  which  their  particular  purpose  is  based,  and  at  the  same  time  allowing  for  the 
maximum  available  muffle  space  to  be  utilized.  They  have  stood  the  rigors  of  keen 
competition  for  many  years  and  are  today  satisfactorily  meeting  the  requirements  of  the 
varied  conditions  throughout  the  world  to  better  advantage  than  ever  before.  We 
strongly  recommend  our  scoriflers  as  being  absolutely  the  best  obtainable  and  without 
an  equal  of  either  domestic  or  foreign  manufacture. 


SIZE. 

inches  in  diameter. 


2% 
3 


No.  in  Barrel. 

3850 

2000 

2000 

1900 

1400 

1000 

800 

600 


Gross  Weight. 
245 
290 
302 
312 
295 
292 
280 
274 


No. 

1365       Scorifiers,   D.   F.  C.  Co.     Our  Own    Manufacture,  Guaranteed. 

Dia.  1V2  2         2%         21/2         2%  3         3% 


4  in. 


Per  1000  $12.00      12.00      12.00      13.00      16.00 
1366       Scorifiers,  D.  F.  C.  Co.     Bartlett  style,  shallow  bowl. 
Dia.  2%         21/2  3  in. 


20.00      25.00      30.00 


Per  1000  $12.00      13.00      20.00 

Examine  your  goods.  None  genuine  unless  stamped  "Denver  F.  C.  Co."  They  have 
many  imitators,  but  no  equals.  Specify  "Denver  Fire  Clay  Co.,"  and  get  products  of  a 
house  with  a  record  who  stand  back  of  their  goods. 


THE  DENVER  FIRE  CLAY  COMPANY. 


263 


The  Denver  Fire  Clay  Co.  Standard  Testing  Sieves 

TIN    FRAMES   WITH    BRASS   WIRE   CLOTH. 


Why  you  should  Use 
The  Denver  Fire 
Clay  Co.  Screens 


A  screen  test  is  of  lit- 
tle value  unless  made 
with  an  accurate,  square 
mesh  testing  sieve.  You 
would  not  put  much  faith 
in  measurements  taken 
with  a  rule  that  had  10 
inches  to  the  foot — then 
why  make  a  screen  test 
with  a  sieve  that  is  from 
5  to  15  meshes  off  in  the 
count  ? 

Our  screen  is  absolute- 
ly square  in  mesh  and 
made  from  the  same 
gauge  wire  both  ways, 
therefore  dependable  in 
testing.  As  an  example, 
100  mesh  screen  will 
count  100  mesh  to  the 
inch  both  ways,  while 
what  is  known  as  the 
"Commercial  Grade"  fine 
brass  cloth  is  irregular 
in  mesh  and  may  count 
100  mesh  one  way  and 
be  off  from  5  to  15  mesh- 
es the  other. 

Uniform,  square  mesh 
testing  sieves  are  an  ab- 
solute necessity  in  mak- 
ing intelligent  compari- 
son of  tests,  therefore- 
our  screens  are  being 
adopted  by  users  who  ap- 
preciate the  value  of  an 
exact  screen  analysis. 


1371 


The  extended  rim  of  each  Sieve  fits  the  top  of 
another  Sieve  of  the  same  diameter. 


264 


THE  DENVER  FIRE  CLAY  COMPANY. 


No. 

1371       Sieves,  Brass  Cloth,  tin  frames,  with  pan  bottom. 

No.  of  Meshes 

Number 

Size  of  Opening 

Price. 

per  Lin.  Inch. 

of  Wire. 

in  Inches. 

Diam.  8  In. 

Diam.  10  In. 

Diam.  12  In. 

10 

24 

.0799 

$1.25 

$1.50 

$2.00 

20 

28 

.0335 

1.25 

1.50 

2.00 

30 

30 

.0195 

1.50 

1.60 

2.10 

40  ^ 

33 

0147 

1.50 

2.20 

2.30 

504 

GO 

35 
36 

.011 
.0091 

1.50 
1.75 

2.25 
2.50 

2.50 
2.75 

70 

37 

.0077 

1.75 

,  /2.50 

2.75 

80 

38 

.00675 

2.00 

/    2.75 

3.00 

90  / 

39 

.0061 

2.00 

3.00 

3.20 

100  »' 

40 

.0055 

2.50 

3.25 

3.50 

120    . 

42 

.0043 

3.00 

3.50 

4.50 

150  • 

44£ 

.0036 

4.00 

5.50 

7.50 

200 

47 

.002 

6.00 

8.00 

10.00 

Examine  your  goods.  None  genuine  unless  stamped  "Denver  F.  C.  Co."  They  have 
many  imitators,  but  no  equals.  Specify  "Denver  Fire  Clay  Co.,"  and  get  products  of  a 
house  with  a  record  who  stand  back  of  their  goods. 


1372 


1382 

1372  Sieves,  as  above,  8  in.  diameter,  in  nests  of  7,  viz.:     20,  30,  40,  50,  60,  80 

and  100  mesh $10.00 

Note: — We  also  nest  above  to  suit  purchaser.     Sieves  of  any  other 
diameter  made  to  order  and  charged  at  lowest  figures. 

1373  Sieve  Covers  for  above. 

For  8  10  12  in.  Sieves. 


Each 


$0.40 


.50 


.60 


1374 
1375 


1376 
1377 
1381 
1382 
1383 


1383a 


1383 

Soldering  Iron  Heaters,  for  gas  . 

Soldering  Coppers,  with  handles. 

Weight  1  1 


1383a 


2  Ibs. 


.90 


Each  $0.60             .75 

Sodium   Spoons,  with  handles 

Slide  Rule.     See  next  page. 

Spatulas,  bone.     Best  quality;   length  5  in 

Spatulas,  glass.  With  ground  blade;   length  6  in. 

Spatulas,  horn.  Best  quality,  very  elastic. 

Length  6               7                8  in. 

Each  $0.12  .15  .20 

Spatulas,  horn.    Double  ends,  superior  quality. 
Length  4567 


1.20 


.Each 


$1.50 


.40 

.15 
.20 


Each 


$0.08 


.10 


.12 


.15 


.20 


10  in. 
.35 


THE  DENVER  FIRE  CLAY  COMPANY. 


265 


Slide  Rule,  Chemists' 


:k?iitd^^ 

fi.iii|itii|iii!}inigg  |nii|in ||| 1 1 |||it^^g|j_L_Qi  n  i.i  1 1 nm  1 1 1 1 1 1 1 1 1 1  n  1 1 1. 


1377 


No. 

1377       Slide  Rule,  Chemists'. 

It  is  the  purpose  of  this  instrument  to  effect  a  reduction  of  the  time  required 
for  the  calculation  of  Chemical  Analyses  to  a  few  seconds,  and  at  the  same  time  to 
increase  the  accuracy  of  the  results.  The  calculations  for  which  it  serves  include 
multiplication,  division,  and  the  determination  of  various  powers  of  numbers.  The 
extraction  of  roots  is  also  possible,  but  is  somewhat  more  complicated  and  not  required 
in  a  chemist's  ordinary  work. 

CALCULATION    OF    ANALYSES. 

This   involves   the   use   of   proportion    and   may   be   expressed    by   the    equation 

FxP 

— g — =  percentage,  in  which  F  is  the  factor,  P  is  the  amount  of  substance  found,  and 

S  is  the  quantity  taken.  As  the  factors  are  constant  numbers  they  have  a  fixed  place 
on  the  slide  rule  and  are  indicated  by  a  mark  on  the  scale.  Certain  elements  are  deter- 
mined in  different  forms  of  combination  and  have  consequently  different  factors.  The 
marks  corresponding  to  the  factors  are  placed  above  the  logarithmic  divisions  in  order 
not  to  cause  confusion.  In  the  calculation  the  runner  must  always  be  employed.  In  the 
case  of  elements  or  atomic  groups,  which  are  always  determined  in  one  and  the  same 
form  of  combination,  for  example  Carbon  as  CO2,  Hydrogen  as  H2O,  there  is  entered 
in  large  letters  along  with  the  factor  the  symbol  of  the  element  or  atomic  group.  In  the 
case  of  elements  which  may  be  determined  in  different  forms  of  combination  the 
symbols  of  these  different  forms  are  expressed  by  smaller  letters.  The  fact  that  the 
factors  appear  distributed  both  on  the  rule  and  on  the  slide  promotes  clearness  and 
facilitates  the  readings Net  $9.00 


266 


THE  DENVER  FIRE  CLAY  COMPANY. 


1385 


1389 


1386 


1390 


1387 


1392 


No. 

1384 


1385 


1386 


1387 


1388 


1389 


1390 


1388 


Spatulas,  nickel,  solid.     Spatula  on  both  ends. 
Length        5  6  7  8  in. 


1394 


Each     $0.40          .50 


.60 


.80 


Spatulas,  porcelain.     Spatula  on  both  ends. 
Length    4%         5%  7  Sin. 


Each     $0.20 


.30 


.35 


.40 


Spatulas,  porcelain.     Stout,  with  knob. 
Length      11  14  17  in. 


Each     $0.60         .80        1.00 
Spatulas,  platinum.     See  platinum  Spatulas,  No.  1267. 

Spatulas,  steel,  with  cocoa  wooden  handle.    For  mixing  and  dividing. 

Blade  3  4  5  6  7  8          10  12  in. 


Each     $0.20 


.25 


.30 


.35 


.45 


.60 


.90        1.50 


Spatulas,  steel,  "artists'  palette  knives."    Wooden  handle. 
Blade          3  4  5  in. 


Each     $0.30 


.40 


.50 


Spatulas,  steel,  nickel-plated.    Steel  handle. 
Length        4567 


9  in. 


Each     $0.50         .55 


.60 


.70 


.80        1.00 


Spatulas,  steel,  solid,  with  knob  on  one  end  or  with  double  ends. 
Length        6  8  10  12  14  16  in. 


Each     $0.20 


.25 


.35 


.45 


.60 


.75 


Sodium  Spoons.     Metal  screen  bowl   $0.50 

Spoons,  Ivory.     For  blow  pipe  work .25 

Spoons,  Bone.    Best  quality,  6  in .25 

Spoons,  Horn.     Best  quality,  with  spatula  end. 

Length        4  5  6  8  10  in. 


Each     $0.10 


.15 


.30 


.40 


THE  DENVER  FIRE  CLAY  COMPANY. 


267 


SOffittlZINB  CHAMBER 


1394a 


13941) 


No. 
1394a 


1394b     No.  136 


Sterilizers,  Hot  Air  Ovens,  for  sterilizing  in  dry  heat,  made  of  Russia  iron, 
with  double  walls  and  connecting  openings  between  the  oven  and  the 
door,  to  secure  a  perfectly  e.ven  circulation. 

No.  1040.       9  inches  high,  12  inches  wide,  9  inches  deep 


1045. 
1050. 
1055. 
1060. 


9 
9 

12 
12 


15 

18 

24 

9 


9 
9 

12 
9 


Larger  sizes  quoted  upon  application. 


1394b 


Sterilizers,  Arnold's,  for  Steam,  maintaining  an  unvarying  temperature  of 
100°  C.  in  all  parts  of  the  sterilizing  chamber,  without  needing  any 
care  or  attention. 

No.     23.     10%  inches  high,    9%  inches  dia.,  heavy  tin,  copper  bottom 
25.     12%       "         "       11%       " 

"       33.     10y8       "        "        9%       "        "     all  copper 

35.     12%       "         "       11%       "         "  "         

136.  Square,  Board  of  Health  Pattern,  of  copper,  with  double  walls, 

and  double  doors,  16  inches  high,  12  inches  wide,  12  inches  deep 

134.  ditto,  14  inches  high,  8  inches  wide,  8  inches  deep 

Other  forms  and  sizes  quoted  upon  application. 


$12.00 
12.50 
14.00 
21.00 
15.00 


3.75 

5.00 

12.75 

16.50 

40.00 
35.00 


268 


THE  DENVER  FIRE  CLAY  COMPANY. 


No. 
1395 


1395 

Stills,  or  Distilling  Apparatus,  for  water,  spirits,  etc.  A  tin-lined  copper  re- 
tort, and  zinc  cooler,  with  block  tin  worm.  All  stills  are  tubulated 
and  of  superior  make. 

Capacity      •  %  1  2  3  5  gal. 


Complete  $10.00 
Separate  parts: 

Still  $6.00 

Condenser    4.00 


12.00      14.00      20.00      25.00 


7.00 
5.00 


8.50 
5.50 


13.00 
7.00 


16.00 
9.00 


1396 


1396  Stills,  "Jewell"  Automatic  Water  Stills,  with  gas  burner;  made  of  machined 
iron  castings,  finished  in  baked  white  porcelain  enamel,  inside  and 
out. 

Capacity  per  hour    y2  1  1%  gallons. 


Price  $25.00 

Larger  sizes  quoted  on  application. 


45.00 


65.00  Net. 


THE  DENVER  FIRE  CLAY  COMPANY, 


269 


1398 


1399 


1397 


No. 
1397 


1398 


1399 


Stills,  "Domestic"  Automatic  Water  Still. 

(a)  Capacity,  13  gals,  in  24  hours  $15.00 

(b)  Capacity,  32  gals,  in  24  hours 25.00 

A  consumes  6  cubic  feet,  b,  14  cubic  feet  gas  per  hour. 

Stills,  "Ralston"   New  Process  Water  Still.     Of  copper-,  plated  with  pure 

block  tin.    Diameter,  9  in.,  height,  14  in 12.00 

The  Pura  Germ-Proof  Aerating  Cap  for  same  .25 

Stills,  for  making  distilled  water  by  steam  heat,  made  of  heavy  copper  with 
steam  coil  near  the  bottom,  provided  with  an  automatic  valve  which  con- 
trols the  water  supply,  also  water  gauge  and  union  to  connect  to  Condenser. 
Very  efficient  and  economical. 

Connect  water  inlet  at  "A,"  steam  inlet  at  "C"  and  outlet  at  "B."     Stop- 
cock at  bottom  is  to  drain  the  still. 
Made  in  two  sizes:    3  gallons    5  gallons. 


Price $30.00 


$40.00 


270 


THE  DENVER  FIRE  CLAY  COMPANY, 


STOPCOCKS 


1401 


1402 


1402 


No. 
1401 


Stopcocks,  brass.    We  furnish  these  with: 


Double  ends,  for  tubing  connections. 

One  end  for  tubing,  the  other  for  male  screw. 

One  end  for  tubing,  the  other  for  female  screw. 

Double  male  screws. 

Double  female  screws. 

Male  and  female  screws. 

%-inch  bore 

*4 -inch  bore 


.Each    $0.75 
.Each       1.00 


1402 


Stopcocks,  of  glazed  acid  proof  stoneware,  straight  or  bent. 
Bore          %  y2  %  lin. 


Each     $2.25        2.50        3.00        4.00 


1410a 


1410b 


1411 


1410       Stopcocks,  glass,   heavy,  for  aspirators,  Woulff  bottles,  etc.     Straight  or 
bent. 

Bore 


1411 


4             6            8  mm. 

l/z      10  mm. 

$1.25        1.50        2.00 
Geissler's. 
%1234567 

Bore 


Each    $0.70    .80      .90     1.00    1.35    1.85    2.50    3.50    5.50 


THE  DENVER  FIRE  CLAY  COMPANY. 


271 


1412 


1413 


1413a 


1412  Stopcocks,  glass,  Geissler's.    Angle  of  45  degrees,  bore  2  mm $1.50 

1413  Stopcocks,  glass,  Geissler's.     3-way. 

Bore        1235  mm. 


Each     $1.00        1.20        1.50        2.00 

1413a     Stopcocks,  glass,  Geissler's.     3-way,  new  style. 
Bore  1235  mm. 


Each     $1.25        1.50        1.75        2.50 


1414 


1416 


1417 


1418 


1414  Stopcocks,  glass,  G.  &  F.,  new  style,  2  mm.  bore $1.20 

1415  Stopcocks,  glass,  G.  &  F.,  new  style,  2  mm.  bore,  with  mercury  seal 2.50 

1416  Stopcocks,  glass,  G.  &  F.,  new  style,  3-way,  bore  2  mm 1.50 

1417  Stopcocks,  glass,  G.  &  F.,  new  style,  with  downway  outlet,  bore  2  mm 1.60 

1418  Stopcocks,  hard  rubber,  bore  %-inch .50 


272 


THE  DENVER  FIRE  CLAY  COMPANY. 


No. 

1421 


1422 


1421  1422 

Stoves,  for  kerosene.    "Improved  Summer  Queen,"  with  water  pan  to  keep 
oil  reservoir  cool. 

With  1  2  3  burners. 


Burner 


4  in.  wide. 


Each    $1.80 
Stoves,  for  kerosene. 
With         1 


2.50        4.00 
"The  American." 

2  3  burners,  4%  in.  wide. 


Each       $1.00        2.00 


3.00 


1423  1423a     Single. 

1423  Stoves,  for  kerosene.  "Khotal."  Of  heavy  polished  brass.  It  burns  kero- 
sene without  any  wick.  Complete  with  detachable  tripod  frame....  $5.00 
1423a  Stoves — Alcohol,  Barthel's.  These  lamps  are  superior  to  most  other  alcohol 
lamps  or  stoves,  as  they  manufacture  their  own  gas  by  vaporizing  the 
alcohol.  No  wick  is  used;  safe,  smokeless,  size  of  flame  readily  ad- 
justed. Substantial  in  construction.  Reasonable  in  price  and  with 
Denatured  Alcohol  (which  is  entirely  suitable  for  use),  economical  of 
maintenance.  One  filling  of  the  reservoir  (about  1  pt.)  of  the  single 
burner  lamp  will  last  with  full  flame  about  1%  hours,  with  medium 
flame  5  to  6  hours. 

Price  of  single  burner  stove,  japanned,  each  4.00 

Price  of  single  burner  stove,  nickel-plated 5.00 

Price  of  double  burner  stove,  japanned,  2*4  pt.  cap 6.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


273 


1424  No.  4 


Stoves,  for  gas.     "Active." 

No.  3,  single,  4%  in.  high,  8%  in.  diameter. 
No.  4,  double,  4%  in.  high,  21  in.  long 


$1.75 
5.00 


1424a 


Stoves,  for  gasoline. 
With  1 


3  burners. 


Each        $3.50 


5.00 


6.50 


1427 


1428 


1425 


1426 


1427 


1428 


1429 


1424a  1429 


Stove  Wicks,  to  fit  stoves  Nos.  1421  and  1422. 
Size  344%  in.  wide. 

Doz.        $0.30         .40  .40 

Stoves;  see,  also,  Burners,  page  108,  and  Lamps,  page  212. 

Streak  Plates;  for  mineralogists  and  for  arsenic  test. 
Size        3x1%         4x2%  in. 


Each 
Each 


$0.25 
.10 


.40  Royal  Meissen. 
.20  Thuringian. 


Strainers,  porcelain,  hemispherical  form. 

Dia.          2%         3^4  4  5 


Gin. 


Each      $0.30 


.35 


.40 


.50 


.75 


Strainers,  porcelain,  flat  bottom,  straight  sides. 
Dia.          4%  8  10  12  in. 

Each     $0.60        1.00        1.25        2.00 
Strainers,  porcelain,  with  handle,  6  in.  diameter,  6  in.  high 


$2.25 


274 


THE  DENVER  FIRE  CLAY  COMPANY. 


1430 


1430a 


1431 


No. 

1430 


1430a 


1431 


1432 


Sulphuretted  Hydrogen  Generator,  Kipp's  form. 
Size      y2  pt.       1  pt.       1  qt.  y2  gal. 

Each     $3.50      4.00       5^00 6^50 

Sulphuretted    Hydrogen    Generator,  Kipp's   improved   form,   of   Bohemian 

glass,  one  quart  capacity   $10.00 

Sulphuretted  Hydrogen  Generator,  Bonn  form. 

Size,  12  in.  high,  3  in.  dia 4.00 

Size,  24  in.  high,  5  in.  dia 8.00 

Sulphuretted  Hydrogen  Generator,  Colorado  form.     Quart  size,  giving  con- 
stant supply 1 .50 


1433 

1433  Sulphuretted  Hydrogen  Generator,  Babo's  form.  Very  handy  where  a  fre- 
quent supply  of  small  quantities  of  H2S  is  needed,  complete,  mounted 
on  improved  stand,  with  rubber  stoppers,  pinchcocks  and  delivery 

tube    

The  semi-circular  tube  alone 1-25 


THE  DENVER  FIRE  CLAY  COMPANY. 


275 


SUPPORTS 


No. 

1440 


1440 


Revolving,  Quick  Filtering  Funnel  Support.  Code  Word,  "Sup." 

This  illustration  shows  our  new  support,  which  is  of  great  advantage 

in  making  a  large  number  of  filtrations  in  a  small  space. 

Fifteen  filtrations  can  be  made  from  one  position  in  a  space  of  two 

feet,  and  by  using  six  of  these  supports  90  filtrations  can  be  carried  on 

simultaneously  on  a  twelve-foot  laboratory  table. 

Construction : 

The  upper  circular  piece  holding  the  funnels  is  eighteen  inches  in 
diameter  and  is  bored  for  fifteen  three-inch  funnels. 

The  lower  circle  is  six  inches  wider;  the  additional  space  is  to  give 
room  for  the  two  vessels  containing  the  filtrate  and  filter  supply. 

The  two  circles  are  rigidly  fastened  to  the  center  post  and  cannot 
get  out  of  their  relative  positions.  The  whole  revolves  on  a  pivot  fastened 
to  the  base  (not  shown),  so  that  from  one  position  the  chemist  can 
manipulate  all  funnels. 

The  circles  are  heavily  ironed  underneath  to  prevent  cracking,  and 
the  construction  throughout  is  very  substantial. 
Price $10.00 


276 


THE  DENVER  FIRE  CLAY  COMPANY, 


1441 


1442 


1443 


No. 

1441       Supports,  triangular  base  and  rod  only,  for  use  with  any  clamp. 

Size       Small.     Medium.     Large.     Extra  Large. 
Rod  16  20  24  36  in. 


Each     $0.35  .50  .75 


1.00 


1442      Supports,  rectangular  base  and  rod  only;  for  use  with  any  clamp.    Length 
of  rod  same  as  No.  1441. 

Size     Small.  Medium.  Large.  Extra  Large. 
Base     4x6          5x8          6x9        7x10  in. 


Each    $0.30          .40  .65          1.00 

1443       Supports,  for  burettes;  iron  base,  rod  and  clamps. 
With  1  2  3  clamps. 


Each       $0.80         1.20  1.60 


THE  DENVER  FIRE  CLAY  COMPANY. 


277 


1444. 


1445 


D 


1447 


No. 

1444 

1445 
1446 


1447 


1446 


Supports,  for  burettes,  iron  with  one  double  Hofmann  Clamp $1.20 

Supports,  for  burettes,  wood,  revolving,  holding  8  burettes 4.00 

Supports,  for  burettes,  hard  wood  clamp,  lined  with  cork. 
For  1  2  burettes. 


Each       $0.85 


1.25 


Supports  for  burettes,  Chaddock's.  Hard  wood  base  with  square  milk 
glass  plate,  ground  to  write  on,  clamp  of  japanned  spring  wire  on 
turned  maple  upright,  thumb  opens  the  rubber-covered  V-shaped 
jaws,  which  close  upon  the  burette  and  hold  it  firm  and  true. 


For  1 

Each        $2.00 


3.00 


3  burettes. 
5.00 


278 


THE  DENVER  FIRE  CLAY  COMPANY. 


No. 

1448 

1449 
1450 


1448 


1449 


1450 


Supports,  for  4  burettes;   solid  porcelain  base,  revolving  clamps;   a  very 

desirable  support   $7.00 

Supports,  for  condensers;  iron,  with  universal  clamp;  height  adjustable...  3.00 

Supports,  for  condensers;  iron,  with  Bunsen's  large  clamp  2  00 


1451 


1451a 


1452 


1451  Supports,  for  condensers;    iron,  with  universal   movemenl $3.00 

1451a     Supports,  for  condensers;   wood,  for  all  sizes 1.50 

1452  Supports,  for  dishes,  flasks,  retorts,  etc.,  "Ring  Stands,"  rectangular  base. 

Rings        1234 


Each     $0.35 


.45 


.65        1.10 


THE  DENVER  FIRE  CLAY  COMPANY. 


279 


1454 


1455 


1456 


1457 


1458 


1458a 


No. 

1453  Supports,  for  dishes,  flasks,  retorts,  etc.,  "Ring  Stands,"  triangular  base, 

same  price  as  No.  1452. 

1454  Supports,  for  dishes,  flasks,  retorts,  etc.,  with  extension  rings. 

Rings       234 

Each    $1.00        •TSO 2.00 

1455  Supports,  for  funnels,  wood,  with  1  arm $0.80 

1456  Supports,  for  funnels,  wood,  with  double  arm .90 

1457  Supports,  for  funnels,  wood,  1  double  arm  for  4  funnels .90 

1458  Supports,  for  funnels,  iron,  with  3  wood-lined  rings 1.50 

1458a     Supports,  for  funnels,  hardwood,  with  iron  clamp;   for  4  funnels;   can  be 

attached  to  any  retort  stand .60 


280 


THE  DENVER  FIRE  CLAY  COMPANY. 


1461 


1459 


1462 


No. 

1459 
1460 
1461 
1462 


Supports,  for  funnels;  height  adjustable,  6  funnels  in  one  line $2.00 

Supports,  for  12  test  tubes  in  one  row  without  pins,  %-in.  holes .40 

Supports,  for  6  test  tubes,  with  pins,  %-in.  holes 45 

Supports,  for  12  test  tubes  in  one  row,  with  12  pins,  heavy  base,  %-in.  holes        .60 


1463 


1464 


1465 


1463  Supports,  for  13  test  tubes  in  two  shelves,  %-in.  holes $0.45 

1464  Supports,  for  13  test  tubes  in  two  shelves,  with  7  pins,  %-in.  holes 60 

1465  Supports,  for  12  test  tubes  in  two  rows,  with  12  pins,  for  large  tubes,  1^-in. 

holes 1.00 


1466 


1467 


1466  Supports,  for  12  extra  large  tubes,  1^4  -in.  holes 

1467  Supports,  for  drying  test  tubes,  with  25  pins 


$1.50 
1.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


1468 


1469 


1470 


1471 


No. 

1468 
1469 
1470 
1471 


Supports,  for  pipettes,  wood,  revolving,  holding  12  pipettes $2.50 

Supports,  Shellbach's,  universal,  wood 2.00 

Supports,  Classen's,  with  two  clamps 4.00 

Supports,  Classen's,  of  metal,  with  1  clamp  and  1  ring 4.00 


1472 
1473 

1474 

1475 
1476 


1472                                  1473                                            1474                           1475  1476 

Support  Table,   adjustable,   12-inch    $1.50 

Syphons,  glass,  with  suction  tube. 
Length     8  12  18 

Each 


24 


30  in. 


$0.30 


.35 


.40 


.60 


.80 


Syphons,  glass,  with  Geissler's  glass  stopcock  and  suction  tube. 
Length     8  12          18          24          30  in. 

Each     $1.10        1^25        1.40        1.60        1.80 

Syphons,  glass,  to  take  out  samples  from  barrels,  etc.,  so-called  "glass 
thieves,"  36  inches  long 

Syphons,  glass,  with  one  handle.     Capacity  250  cc $0.50;  500  cc. 


1.20 
.60 


282 


THE  DENVER  FIRE  CLAY  COMPANY. 


TEST  TUBES 

FREE  FROM   LEAD. 


1481 


1482 


1491 


1492 


1493 


1494 


No. 

1481 


1482 

1483 
1491 


1492 
1493 

1494 
1495 


Test  Glasses,  with  lip,  coming  to  fine  evenly  coned  point. 
Capacity       1  2  4  6  8  oz. 


Each 


.20 


.25 


.30 


.35 


Test  Paper,  blue  and  red  Litmus  and  Turmeric. 

In  small  books    Each,  $0.05;    Doz.     $0.50 

In   sheets    Each,      .05;  Quire        .60 

In  tape  form,  perforated  strips,  in  metal  box;    per  box  of 
100  strips,  red  or  blue   


Test  Paper,  Squibb's  Litmus,  in  vials,  blue,  red  and  neutral  ..........  Vial 

Doz. 

Test  Tubes,  best  German  glass,  well  annealed,  free  from  lead,  each  piece 


wrapped  in  paper. 

Size  3x3/8      4xi/2      5xi/2      5x5/8 


6x%  in. 


Doz. 

$0.15 

.20 

.25 

.25         .30 

.30 

Gross 

1.50 

2.00 

2.25 

2.50       2.60 

2.80 

1 

Size 

6x% 

6x1 

7x% 

8x1        9x1 

10x1  in. 

Doz. 

$0.30 

.40 

.45 

.60         .80 

1.20 

Gross 

3.00 

4.50 

4.50 

6.00       8.00 

10.00 

Test 

Tubes,  with  side 

neck. 

Length 

5 

6 

7 

8  in. 

Doz. 

$0.75 

.85 

1.00 

1.30 

Test 

Tubes,  on  foot. 

Height 

5 

6 

7 

8  in. 

Doz. 


$0.75         1.00         1.25 


1.50 


Test  Tubes,  graduated;   capacity  10  cc.  in  1-10 

Test  Tubes,  of  hard  glass;  see  Ignition  Tubes,  No.  1585. 

Test  Tube  Caps,  of  rubber,  for  bacteriological  purposes. 

%  in.  diameter Doz. 

1  in.   diameter . .  Doz. 


.10 

.15 

1.75 


.40 


.30 
.40 


THE  DENVER  FIRE  CLAY  COMPANY. 


THERMOMETERS 

Made  of  Jena  Normal  Glass;  best  European  manufacture;  all  provided  with  Air  Bulbs. 

O 


1501 


1502 


1503 


No. 

1501 


1502 


1503 


1503a 
1504 

1505 
1506 
1507 


Thermometers,  chemical;   scale  engraved  on  stem,  with  white  back,  very 
exact;  in  pasteboard  case. 

Grad.  to        100         150         200         250      360°  C. 

7«T      1.60 


Each 
Grad.  to 


$1.10 
212 


1.20 

400 


1.30 

600° 


F. 


Each          $1.10         1.30        1.50 

Thermometers,  chemical;  milk  glass  scale,  enclosed  in  glass  tube;  in  paste- 
board case. 

Grad.  to        100         200         250         360°  C. 


Each 
Grad.  to 


$1.10 
212 


1.30 

400 


1.40 

600° 


1.60 


F. 


Each  $1.10         1.30  1.50 

Thermometers,   chemical;    paper  scale,  enclosed  in  glass  tube,  in  paste- 
board case. 

Grad.  to        100         200  250°  C. 


Each 
Grad.  to 


$0.60 
212 


.75 

400 c 


1.00 


F. 


Each          $0.70          .80 

Thermometers,  paper  scale,  only  8  inches  long,  reading  to  100°  C.  or  212° 

Each 
Thermometers,  chemical;  with  two  scales  engraved  on  the  stem. 

Registering  100°  C.  and  212°  F 

Registering  200°  C.  and  400°  F 

Registering  300°  C.  and  600°  F ' 

Thermometers,  chemical;  filled  with  nitrogen,  to  prevent  the  separation  of 

the  mercury;  engraved  on  the  stem,  0°  to  400°  C.  or  0°  to  700°  F... 

Thermometers,   Normal;    filled   above   mercury  with   carbonic   acid.     "With 

zero  point,  graduated  on  tube  180°  to  550°  C.  or  200°  to  1000°  F 

Thermometers,  chemical;  engraved  on  stem. 

Grad.  from      0°  to    50°  C.  in  1-10° 

Grad.  from      0°  to  100°  C.  in  1-5  ° 

Grad.  from      0°  to  100°  C.  in  1-10° 

Grad.  from  100°  to  200°  C.  in  1-5  ° 

Grad.  from  100°  to  200°  C.  in  1-10°. . 


F. 
$0.50 

2.00 
2.25 
2.50 


2.50 
10.00 

3.00 
3.25 
4.00 
3.50 
4.00 


284 


THE  DENVER  FIRE  CLAY  COMPANY. 


SPECIAL  THERMOMETERS  MADE  TO  ORDER   IN   OUR  GLASS 
BLOWING  DEPARTMENT. 


1510 
No. 

1508 


1509 


1510 


1511 


1512 
1513 
1514 
1515 
1515a 

1516 


1517 

1518 

1518a 

1519 

1520 


1512 


1514 


1515 


1516 


Thermometers,  Anschuetz';  Jena  Normal  glass.  Standard  set  for  chemical 
work,  especially  for  fractional  distillations;  length  10  to  14  cm.,  dia. 
6  mm.  Each  instrument  has  ring  for  suspending.  Nos.  4  to  7  are 
filled  with  nitrogen. 

Set  as  below,  graduated  in  y2  °,  in  fine  leather  case $30.00 

No.  1,  from    10°  to    55°  C.  No.  5,  from  195°  to  265°  C. 

No.  2,  from    45°  to  105°  C.  No.  6,  from  240°  to  310°  C. 

No.  3,  from   96°  to  160°  C.  No.  7,  from  295°  to  360°  C. 

No.  4,  from  140°  to  220°  C. 

Thermometers,  chemical,  graduated  on  stem,  and  this  one  again  enclosed 
in  glass  tube  to  prevent  graduation  from  wearing  off. 
Grad. to   150°  C.       400°  F. 
Bach          $2.00        2XH) 

Thermometers,  technical;  in  armored  case  to  protect  stem  from  breaking 
when  thrown  into  vessels. 

Grad. to  360°  C.      600° F. 
Each          $4X)0         4.00 

Thermometers,  chemical;  bent  at  right  angles,  scale  enclosed  in  glass  tube. 
Grad. to   100°  C.     212°  F. 
Each          $2~50 2750~ 

Thermometers,  Incubators;  graduated  from  10°  to  50°  C.  % 2.00 

Thermometers,  "Minimum;"  10  in.,  boxwood,  finely  polished 1.50 

Thermometers,  "Maximum;"  10  in.,  boxwood,  finely  polished 1.50 

Thermometers,  "Maximum  and  Minimum;"  combined  in  one  instrument..       3.60 
Thermometers,  "Maximum  and  Minimum;'  U.  S.  Weather  Bureau  pattern, 

mounted  on  one  board 10.00 

Thermometers,  in  japanned  tin  frames,  good  quality. 
Length          8 10 12  in. 

Each  $0.30  .40  .50 

Thermometers,  Floating,  dairy,  0 — 150°  F Each,  20c;   Doz.       2.00 

Thermometers,  Floating,  paper  scale,  8  in.  long,  100°  C.  or  220°  F 40 

Thermometers,  Floating,  paper  scale,  12  in.  long,  100°  C.  or  212°  F 50 

Thermometers,  Household,  10  in.  long,  on  cherry  back 1.00 

Thermometers,  Brewers',  12  in.  long,  copper  cup  case 2.50 


THE  DENVER  FIRE  CLAY  COMPANY. 


285 


TONGS 


1533a 


1524 


1525 


1527 


1528         1529       1530    1531 


1529a 


No. 

1521       Tongs,  crucible,  forged  steel,  single  bent,  nickel-plated,  9  in.  long 

Tongs,  crucible,  forged  steel,  double-bent,  nickel-plated,  9  in.  long 

1523  Tongs,  crucible,  same   as   No.   1521   or   1522,   with    heavy    platinum    shoes. 

Price  according  to  weight  of  platinum,  approximate  price 

I523a    Tongs,  crucible,  pure  nickel,  double  bent,  strong,  9  in.  long 

1523b     Tongs,  crucible,  aluminum,  double  bent,  light,  8  in.  long 

1524  Tongs,  crucible,  rod  iron,  single  bent,  japanned,  9  in.  long 

1525  Tongs,  crucible,  rod  iron,  double  bent,  japanned,  9  in.  long 

1526  Tongs,  crucible,  rod  iron,  double  bent,  japanned,  18  in.  long 

1527  Tongs,  crucible,  steel,  single  bent,  30  and  36  in.  long 

1528  Tongs,  crucible,  steel,  double  bent,  30  and  36  in.  long  

1529  Tongs,  crucible,  steel,  double  bent,  for  lifting  crucibles  vertically,  36  inches 

long    

1529a    Tongs,  crucible,  used  when  lifting  black-lead  or  other  heavy  crucibles  with 
a  crane,  so-called  "basket  tongs." 

For  crucibles  Nos.  10  to  20         25  to  50         60  to.100     125  to  150 

Each"  $12.00  14.00  18.00  25.00 

Larger  sizes  to  order. 

1529b     Tongs,  crucible,  steel,  crucible  lifter,  to  take  crucibles  of  any  size  up  to  30 
grm.     40  inches  long,  each 

1530  Tongs,  cupel,  steel,  light,  30  and  36  in.  long 

1531  Tongs,  cupel,  steel,  light,  with  flat  rounded  ends,  30  and  36  in.  long 

1532  Tongs,  scorifier  and  crucible,  steel,  light,  30  and  36  in.  long 

1533  Tongs,  for  Matrasses  and  flasks,  brass,  cork-lined,  7  in.  long 

1533a     Muffle  Scrapers,  36  in.  long 

Tongs,  any  size  made  to  order. 


$0.70 
.80 

8.00 

3.00 

1.00 

.30 

.40 

1.00 

1.50 

1.50 

3.50 


1.00 
1.00 
1.00 
1.00 
1.00 
.60 


286 


THE  DENVER  FIRE  CLAY  COMPANY. 


No. 

1534 


1534 


Transit,  Brunton  Patent  Pocket  Mine  Transit.  The  cut  illustrates  a  new 
pocket  instrument  which  furnishes  means  for  performing,  within  the 
limits  of  accuracy  imposed  by  its  size  and  construction,  the  oper- 
ations for  which  the  ordinary  transit  is  used.  The  instrument  has 
been  designed  especially  to  meet  the  wants  of  mining  engineers,  mine 
managers  and  superintendents,  but  its  peculiar  features  render  it  ad- 
mirably adapted  to  the  requirements  of  geological  field  work,  the  tak- 
ing of  topography,  and,  in  short,  to  any  purpose  for  which  a  light 
pocket  instrument  is  desirable,  and  where  a  moderate  degree  of  ac- 
curacy will  suffice Net  $25.00 

Leather   carrying  case 2.00 


1535 


1535  Transit,  Verschoyle  Patent  Transit.    This  instrument  combines  the  useful 

features  of  Abney  Level  Prismatic  Compass  and  Clinometer.  The  dis- 
tinguishing feature  of  the  instrument  is  that  owing  to  its  novel  con- 
struction, only  one  observation  is  necessary  to  obtain  both  the  mag- 
netic bearing  and  the  vertical  angle  of  any  distant  point.  It  is  unex- 
celled for  rapid  topographical  work  and  working  in  constrained  posi- 
tions. It  is  constructed  in  such  manner  as  to  withstand  the  hard 
usage  an  instrument  of  this  kind  is  liable  to  receive.  Figure  shows 
the  instrument  with  sight-arm  extended  ready  to  make  an  observation.  $35.00 

1536  With  block  angle  piece  and  collapsible  tripod 45.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


287 


Ains worth's  Precision  Transits 


Type  BD 


Type   BF 


No. 

1538       Transit,  Ainsworth   Precision: 

Type  BD  precision  transit  with  5  in.  limb,  4^  in.  verticle  circle,  10  in. 
erecting  telescope,  gradimeter,  3*£  in.  compass  variation  plate  com- 
plete in  mahogany  carrying  case,  with  extension  tripod.  Price $250.00 

Type  BE  precision  transit;    same  as  above,  but  with  8  in.  auxiliary  side 
telescope  for  vertical  sighting.     Price 290.00 

Type  BF  precision  transit;  same  as  type  BD,  but  with  8  in.  interchange- 
able auxiliary  telescope  for  vertical  sighting.  Price 310.00 


288 


THE  DENVER  FIRE  CLAY  COMPANY. 


Mountain  and  Mine  Transit 

As  Designed  and  Made  by  WEISS  &  HEITZLER 


Cut  1 

Shows    Transit    for    general    use. 

Center  of  Telescope  over 

center  of  Instrument. 


Cut  2 

Shows     Transit    for    mine    work. 

Telescope  clears  plate 

at  90°. 


No. 
1539 


Transit,  Mountain  and   Mine: 


GENERAL    DESCRIPTION    AND    EXTRAS. 

Dimension  of  horizontal  limb  5*4".  Double  opposite  vernier  reading  to  1  minute. 
Vertical  circle  reading  to  1  minute.  Graduations  all  on  solid  silver.  Sensitiveness  of 
vials  1  division  equal  to  1  minute  of  arc. 

Telescope  aperture  1  1-16".  Magnification  17.  Fixed  Stadia  hairs.  Abbe  prism 
system.  Erect  image.  Inverted  telescope  will  be  substituted  if  desired,  but  it  will  not 
have  the  same  magnification,  because  focus  will  be  shortened. 

Finish  of  instrument,  bright  or  black,  as  ordered.  U  Standard  japanned.  Needle 
2  5-16". 

Price  of  instrument  complete  with  extension  tripod,  box,  plumb  bob,  key 

and  adjusting  pins $350.00 

Diagonal  prism,  extra 8.00 

Shade  for  illuminating  cross  wires 4.00 

Plummet  lamp  made  of  bronze  and  hard  steel  point.     Weight  15  oz 8.00 

Leather  case  with  shoulder  straps 12.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


289 


TRIANGLES 


1544 


1545 


1546 


No. 

1544  Triangles,  plain  iron;   small,  medium,  large Bach  $0.05;  Doz.     $0.50 

1545  Triangles,  pipestem  covered  iron  wire;  small,  medium,  and  large 

Each,  $0.10;  Doz.         .75 

1546  Triangles,  pipestem  covered   iron  wire;  improved  form;  small,  medium  and 

large    Each  $0.10;  Doz.      1.00 


1547a 


1548 


1547      Triangles;  pure  nickel,  plain. 
Sides  5 


7  ctm. 


Each  $0.20  .25  .30 

1547a     Triangles;  according  to  Heraeus,  of  nickel  with  3  platinum  points $3.00 

Triangles;  platinum,  see  Platinum  Triangles,  No.  1271. 

1548       Triangle  Holders;  Sargent's  adjustable;  holding  triangles  firm  and  in  place       1.00 


290 


THE  DENVER  FIRE  CLAY  COMPANY. 


1549 


1551 


1552 


1553 


No. 
1549 

1550 
1550a 

1551 
1552 
1552a 
1553 


Trays,  of  paper,  S.  &  S.,  for  drying  small  quantities  of  crystals  from  the 

water  of  crystalization.     Per  box  of  25  trays $3.25 

Trays,  for  annealing  cups;  of  fire  clay,  for  handling  annealed  cups  in  muf- 
fles.   Also  extensively  used  for  silica  fusions.    See  Fig.  135 Each 


Trays,  for  cupels,  holding  16  cupels,  with  detachable  handle,  all  iron.     See 
Fig.    749 

Tripods,  brass,  dissectible,  for  alcohol  lamps   

Tripods,  iron,  Bunsen's,  for  burners  

Tripods,  iron,  small,  for  alcohol  lamps  6"  high 

Tripods,  iron;  with  concentric  rings. 

With  234 

Each 


.75 

.75 
.60 
.30 
.20 


5  rings. 


$0.30 


.40 


.60 


.90 


1555 


1556 


1557 


1554 
1555 


1556 


Troughs,  mercury;  porcelain,  cross  form,  capacity  6  Ibs.  mercury. 
Troughs,  mercury,  porcelain,  oblong. 

Capacity       8  16  Ibs. 


$0.90 


Each 

$1.00 

1.50 

Troughs, 

glass,  with 

ground  off 

rims. 

Length 
Width 

8 
4 

10 
6 

12  in. 
Sin. 

Height 

4 

5 

6  in. 

1557 


Each  $1.50  2.00             3.00 

Troughs,  pneumatic,  japanned  zinc,  with  sliding  shelf  and  overflow. 

Size  4x7x10  5x9x12      6x11x15     8x12x18  in. 

Each  $1.25  1.50             1.75            2.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


291 


TUBES 


1561 

No. 

1561 


1562 


1563 


1564 


Tubes,  calcium  chloride,  with  one  bulb. 

Length  345 


1565 


Sin. 


1566 


1562       Tubes, 


1563       Tubes, 


Each          $0.08        .09        .10 
calcium  chloride,  with  two  bulbs. 
Length             567 

.12 

8 

.15 

10  in. 

Each           $0.12         .15         .18 
calcium  chloride,  U  shaped,  plain. 
Length             345 

.20 

6 

.25 

8         10  in. 

1564 


1565 


Tubes, 
Tubes, 


Each  $0.12         .14         .16         .20         .30 

calcium  chloride,  U  shaped,  with  side  tubes. 
Length  4  5  6  8  in. 


.40 


Each  $0.15         .20         .25         .35 

calcium  chloride,  Wcehler's,  with  three  bulbs. 
Length  4  5  6  in. 


Each  $0.30         .40 

1566       Tubes,  calcium  chloride,  Volhard's. 

Length  5  6  in. 


.50 


Each 


$0.30 


.35 


1567 


1568 


1569 


1570 


1568  1569 


Tubes,  calcium  chloride,  Marchand's. 

Length  4  5  G  in. 


1570 


Each  $0.30         .35         .40 

Tubes,  calcium  chloride,  Bischof's,  with  perforated  stopper. 
Length  4  5  6  in. 


Each  $1.00       1.15       1.25 

Tubes,  calcium  chloride,  Braun's,  with  side  bulb  and  perforated  stopper. 
Length  4  5  6  in. 


Each           $1.10       1.20       1.40 
Tubes,    calcium    chloride,    Thoerner's 


$2.00 


292 


THE  DENVER  FIRE  CLAY  COMPANY. 


1574 


1579 


1583 


1584 


No. 

1571 
1572 
1573 
1574 
1575 


1576 
1577 


1578 
1579 
1581 
1582 
1583 
1584 


1584a 


Tubes,  condensing,  Liebig's,  for  sulphurous  acid $3.00 

Tubes,  condensing,  Schumann's,  for  sulphurous  acid 2.50 

Tubes,  condensing,  Fischer's,  for  sulphurous  acid 3.50 

Tubes,  condensing,  W  shape,  6  in.  high .50 

Tubes,  connecting,  T  shape  glass. 

Bore  i/8       3-16          %          %          %-         %  1  in. 

Each  $0.08       .10          .12         .15         .18         .25  .40 

Tubes,  connecting,  Y  shaped,  glass,  same  prices  as  No.  1575. 
Tubes,  connecting,  T  shape,  brass. 

Bore  3-16          %          %          Vz  in. 


Each  $0.30         .35         .40         .50 

Tubes,  connecting,  Y  shape,  brass,  same  prices  as  No.  1577. 

Tubes,  connecting,  T  shape,  glass,  with  two  Geissler's  stopcocks 2.25 

Tubes,  distilling,  for  fractional  distillation,  plain .25 

Tubes,  distilling,  with  one   bulb .30 

Tubes,  distilling,  Glinsky's,  with  glass  valves,  12  in 1.50 

Tubes,  filtering,  Gooch's,  of  glass,  for  Gooch  crucibles,  or  "Carbon  Filters." 

Dia.  20          25          28          31          34          38mm. 


Each          $0.15         .20        .25         .30         .35 
Tubes,  ignition,  heavy  test  tube  form,  lead  free  glass. 
Length  4  5  6  8  in. 


.40 


Doz. 


$0.60        .80 


1.00 


1.50 


THE  DENVER  FIRE  CLAY  COMPANY, 


293 


\ 


1586 

No. 

1585 


1586 


1587 
1588 


1588a 
1589 


1587 


1588 


1589 


Tubes,  ignition,  hard  glass,  straight. 
Length.  4  5 


Sin. 


Each  $0.08         .10         .12         .20 

Tubes,  ignition,  hard  glass,  with  bulb  at  end. 

Length  4  5  6  8  in. 


Each  $0.15         .18         .20         .30 

Tubes,  reduction,  for  arsenic  test.     Form  a,  b,  c, 
Tubes,  reduction,  hard  Bohemian  glass. 

With  1  2  3  bulbs. 


d Doz.     $0.30 


Each          $0.20        .25        .30 

Vanning  Plaques,  of  enameled  iron,  see  Fig.  1035a. 
Vises,  Hand,  black,  with  bright  jaws,  extra  quality. 

Size 4  6  6  in. 

Each          $6760        £0      1.00 


.Each       1.00 


1602-3 


1590 


1601 


1602 
1603 

1604 


1590 

Vises,  Bench,  with  anvil. 
Size 


1604 


41bs. 


Each  $1.00       1.25       1.50       1.75 

Watch  Glasses,  best  quality,  well  annealed,  with  ground  edges. 
Dia.        1%    1%        2    2V2    2%        3    3%          4      4%          5 


Sin. 


Doz.   $0.20     .25     .25     .40     .50     .60     .80      1.00     1.20     1.50     2.00     3.00     4.00 

Watch  Glass  Clamps,  nickel-plated,  for  2  and  2%  in.  sizes $0.20 

Watch  Glass  Clamps,  nickel-plated,  for  3  and  3%  in.  size 25 

Watch  Glass  Clamps,  Bunson's  wire  form,  nickel-plated 2  in.  dia.         .20 

2%  in.  dia.         .25 


294 


THE  DENVER  FIRE  CLAY  COMPANY. 


WATER  BATHS 


1611 


1612 


No. 


1611       Water   Bath,   heavy   copper,  tin   lined,   with   concentric   rings   and   cover, 
handles  and  steam  escape. 

Dia.  4          5      5V2          6          8        10        12  in. 


Each 


$1.00     1.20     1.40     1.60     2.50     5.00     9.00 


1611a    Water  Bath,  of  cast  iron,  nickel-plated,  6  in.  dia.,  same  shape  as  No.  1611, 

but  without  steam  escape $1 .00 

1612       Water  Bath,  heavy  copper,  tin  lined  and  with  Kekule's  constant  water  level. 
Dia.  4         5      5V2          6         8       10  in. 


Each 


$1.50     1.75     2.00     2.25     3.00      5.50 


1613 


1613  Water  Bath,  heavy  copper,  with  three  6-in.  and  four  4-in.  openings,  all  pro- 
vided with  concentric  rings  and  cover  in  center;  with  stopcock  and 
constant  water  regulator.  Size  23  x  14  x  5  in $20.00 

1613a     Water  Bath,  same  as  No.  1613,  but  fitted  with  a  coil,  to  be  heated  by  steam.    25.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


295 


1614 


No. 


1614  Water  Bath,  of  copper,  same  as  No.  1613,  but  with  only  four  5-in.  holes; 

size   14x14   in $1 4.00 

1614a     Water  Bath,  same  as  No.  1614,  but  fitted  with  a  coil,  to  be  heated  by  steam.     18.00 

1615  Water  Bath,  of  copper,   for  hot  filtration  and  evaporation;  size  13x7x5  in.     12.00 


1615 


1617 


1616  Water  Bath,  of  copper,  cylindrical,  with  round  tray  for  12  test  tubes $4.00 

1617  Water  Baths,  cylindrical,  of  iron,  porcelain-lined  inside,  with  set  of  copper 

rings  and  cover. 


Dia. 
Each 


Sin. 


$1.50         2.00         3.00 


296 


THE  DENVER  FIRE  CLAY  COMPANY. 


No. 
1618 


1619 


1618 


Water  Heaters,   Electrical,  of  seamless  copper,  nickel-plated,  and  double 
tin-lined. 

(a)  Pint  size,  one  heat,  with  6  feet  of  cord  $5.50 

(b)  Quart  size,  one  heat,  with  6  feet  of  cord 7.00 

Water  Heaters,  Electrical,  coil  form,  for  immersion  in  water,  etc. 

One  heat,  100  watts  to  2500  watts  $6.50  to     18.00 

Three  heats,  110  watts  to  2500  watts   8.00  to     22.00 

The   three-heat   coils   are   recommended   where   the   water   is   to   be 
kept  hot  for  any  length  of  time. 


1620 

1620      Water  Heater,  Fletcher's,  instantaneous   $4.00 

Complete  with  burner    6.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


297 


No. 
1621 


1625a 


Water  Motor,  Babes',  small  size  to  operate  stirring  or  shaking  apparatus 
in.  laboratories. 


No.   12 

14 

16 

18 

20 

22 

24 

$0.40 

.42 

.45 

.48 

.50 

.55 

.60 

No.   26 

27 

28 

30 

32 

34 

36 

1621a     Wire,  copper. 

B.  &  S.  Gauge  No. 

Per   Ib.    spool 

B.  &  S.  Gauge  No. 

Per  Ib.  spool  $0.65         .70        .75         .80     .1.00       1.20       2.00 

1621b     Wire,  copper,  cotton  covered  No.  18,  s.  c.  office  or  annunciator  wire...lb.        .50 

1622  Wire,  iron,  pure  for  standardizing Per  oz.  bottle  $0.15;  10  bottles       1.30 

1623  Wire,  German  Silver,  on  %  Ib.  spools. 

No.  16          18          20          22          24          26          28          30  B.&  S. 


Spool         $0.30         .30         .35         .40 
Wire,  platinum,  see  Platinum  Wire,  No.  1273. 


.45 


.50 


.55 


.60 


1625b 

1625       Wire  Baskets,  for  bacteriological  work, 
(a)   Round       5x5  7x7 


9x9  in. 


Each         $0.50  .60  .75 

(b)   Square     5x5x5     7x7x7     9x9vx9in. 


Each         $0.50 


.60 


.80 


298 


THE  DENVER  FIRE  CLAY  COMPANY. 


No. 
1631 


1634 


Wire  Gauze, 


1636 


1637 


10 


20 


30 


40 


50 


60 


1632       Wire  Gauze, 


brass. 
Mesh 

Sq.  ft. 
Mesh 

Sq.ft.       $0.90      1.10      1.30      1.70      3.00      6.00 

copper,  for  combustions,  etc. 
Size  20         40         60 


70 


$0.50 

80 

.50 

90 

.52 

100 

.55 

120 

.58 
150 

.60 

200 

.70 

80       100  meshes. 


Sq.ft.       $0.60        .70        .80      1.20      1.50 


1633       Wire  Gauze, 


iron. 

Size 
Sq.  ft. 


10 


14 


16 


20 


40 


60 


meshes. 


$0.20        .25        .28        .30        .35        .45        .70      1.00 


1634  Wire  Gauze,  iron,  correct  thickness  for  heating  beakers,  dishes,  etc. 

Size  4  56  8  in.  sq. 

Bach         $6.1)6        io8       TlO        ^20 

1635  Wire  Gauze,  brass,  correct  thickness  for  heating  beakers,  dishes,  etc. 

Size  4          5          6          8  in.  sq. 

Each 


.15        .20 


.40 


1636       Wire  Gauze, 


$0.10 

tinned  iron,  with  flat  asbestos  center. 
Size  4          5          6  in.  sq. 

Each         $0.12        .15 


$0.12        .15        .20 

1637       Wire  Gauze,  tinned  iron,  with  hemispherical  asbestos  center. 
Size  4  5  6  8  in.  sq. 

Each         $0.30        AO        i50       ^60 


1641 


1642 


1641  Wire  Gauges,  American  standard,  5-36   $3.00 

1642  Wire  Gauges,  micrometer,  giving  fractions  of  inches  or  millimeters,  in  mo- 

rocco case,  B.  &  S.  No.  15 6.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


299 


The  Johnson  *  "Rapid"  Zinc  Shaving  Lathe 


PATENTED. 


1650 
Code  Word,  "Joh." 


No. 

1650       Zinc  Shaving  Lathe: 

The  development  of  this  new  and  successful  machine  has  been  based  on  the 
experience  of  many  months  spent  in  the  production  of  zinc  shavings  for  the  market. 

The  experience  gained  in  this  work,  together  with  some  of  the  problems  connected 
with  the  rapid  and  economical  production  of  the  highest  grade  of  zinc  shavings  for 
cyanide  work  has  resulted  in  the  production  of  a  machine  that  most  fully  answers  all 
requirements  and  is  now  in  use  in  some  of  the  largest  mills  in  the  country. 

The  lathe,  as  shown  in  the  engraving,  is  of  the  type  in  which  the  shavings  are 
cut  from  commercial  sheet  zinc,  taking  sheets  36  inches  in  width,  which  are  wound  on 
an  arbor  under  pressure,  the  shavings  being  cut  by  a  side  tool  fed  automatically. 

This  process  is  not  new,  and  is  sometimes  used  by  adapting  an  ordinary  engine 
lathe  to  the  service,  but  at  best  this  is  makeshift,  as  compared  with  a  properly  designed 
machine  made  for  this  purpose  especially.  For  instance,  the  tool  post  arrangements 


300  THE  DENVER  FIRE  CLAY  COMPANY. 


are  not  suitable  for  attaching  the  pressure  winding  device;  also  the  heat  generated  by 
the  cutting  expands  the  arbor,  and  if  not  attended  to  is  likely  to  destroy  the  center. 
Aga'n,  there  being  no  provision  in  the  construction  of  the  ordinary  lathe  for  a  clear 
fall  for  the  shavings  from  the  arbor,  they  are  apt  to  become  tangled  or  wound  again, 
thus  causing  frequent  stoppage. 

In  the  design  of  the  Johnson  Zinc  Lathe  the  following  are  some  of  the  more 
important  points  that  have  been  provided  for: 

THE  BED  CASTING. 

The  bed  casting  is  of  complete  box  form  (the  strongest  possible  shape),  the  front 
edge  being  formed  as  a  bearing  to  support  the  carriage,  the  rear  portion  slanting 
backward  to  allow  the  shavings  a  free  discharge  to  the  floor  or  bin.  The  three  bearing 
boxes  for  the  spindle  are  cast  integral  with  the  bed,  which  gives  the  rigidity  that  is 
required. 

THE  SPINDLE. 

The  spindle  is  of  the  highest  grade  mild  steel,  of  ample  size,  and  accurately 
turned  and  ground. 

THE  ARBOR  OR  DRUM. 

The  arbor  is  of  extra  heavy  6-inch  pipe,  fitted  to  the  spindle  by  means  of  heavy 
flanges.  The  tail  end  of  spindle  being  hollow  serves  as  a  passage  for  a  stream  of  cooling 
water.  The  greatest  care  is  taken  in  the  fitting1  of  this  arbor  that  it  should  be  true, 
solid  and  water-tight. 

THE   TOOL  HOLDER. 

The  tool  holder  is  of  special  design  that  not  only  holds  the  cutting  tool  very 
rigidly,  but  provides  as  well  for  securing  the  Automatic  Pressure  Winding  Device. 

THE  PRESSURE  WINDING  DEVICE. 

This  is  a  simple  and  effective  device  that  is  easily  applied,  by  which  the  sheets 
are  wound  tightly  on  the  arbor,  and  held  until  soldered  or  otherwise  secured. 

THE  FEED   GEARING. 

The  automatic  feed  is  operated  by  means  of  a  train  of  gears  acting  through  a 

worm  and  wheel  on  a  steel  pinion  and  rack;   this  gives  a  travel  of  from  .001-inch  per 

'  revolution  of  the  spindle,  producing  shavings  of  from  .002-inch  to  .004-inch  in  thickness. 

THE  WATER  .COOLING  DEVICE. 

This  important  feature  is  worked  out  in  a  very  simple  and  effective  manner,  the 
arrangement  requiring  no  stuffing  boxes  and  no  parts  subject  to  wear,  and  having 
capacity  to  maintain  the  arbor  in  a  perfectly  cool  condition.  This  prevents  the  zinc 
from  becoming  heated  so  as  to  produce  a  poor  quality  of  shavings. 

Among  the  advantages  of  this  lathe  we  may  note: 

1.  The  use  of  plain  commercial  sheet  zinc. 

2.  The  exceedingly  small  percentage  of  waste. 

3.  The  uniformity  of  product  which  can  be  maintained  indefinitely. 

4.  The  approved  quality  and  strength  of  shavings  produced,  owing  to  the  perfect 
cooling  arrangements. 

5.  And  last,  but  not  least,  the  large  capacity,  the  product  per  day  of  nine  hours 
being  from  eight  to  nine  hundred  pounds  of  shavings  cut  to  thickness  of  two  and  a  half 
thousandths  of  an  inch. 

Countershaft  furnished  has  16x4-inch  pulleys  and  should  be  speeded  to  180  revolu- 
tions per  minute.  Spindle  speed,  260  revolutions  per  minute.  Power  required,  4  horse- 
power. 

The  water  cooling  and  other  special  features  are  covered  by  U.  S.  patent.  Weight 
1,700  pounds.  Price  on  application. 


THE  DENVER  FIRE  CLAY  COMPANY. 


301 


BLOW  PIPE  APPARATUS 


2 
3 
4 
5 
6 
7 
9 

11 

12 
13 
14 

15 
16 
17 
18 
19 
20 


Blow  Pipe  Apparatus,  according  to  Prof.  Plattner,  for  qualitative  and  quan- 
titative blow  pipe  analysis,  made  after  samples  taken  from  the  original 
"Freiberg"  set. 

Anvil,  small,  best  polished  steel 

Balance,  Plattner's,  in  polished  case,  with  set  of  weights 

Beakers,  lipped,  000  to  0 

Blow  Pipe,  Black's  conical  form  with  brass  tip 

Blow  Pipe,  jewelers'  form,  plain 

Blow  Pipe,  brass,  jewelers'  form,  with  bulb 

Blow  Pipe,  Berzelius',  of  brass,  with  platinum  plate 

Blow  Pipe,  Plattner's,  nickel-plated,  with  movable  platinum  tip  and 
hard  rubber  mouth-piece 

Blow  Pipe  Lamp,  Plattner's,  nickel-plated 

Blow  Pipe  Lamp,  Plattner's  nickel-plated,  with  patent  swivel 

Blow  Pipe  Lamp,  Fletcher's,  polished  brass 

Blow  Pipe  Lamp,  Fletcher's,  brass,  nickel-plated 

Blow  Pipe  Lamp,  tin,  for  tallow 

Burners,  Bunsen's,  with  tip  and  tube  for  blow-piping 

Button  Brush 

Capsules,  of  porcelain 

Carbon  Blocks,  moulded,  4  in.  diameter 

Carbon  Cylinders,  moulded,  3  x  1%  in 


$  0.50 

22.00 

.25 

.25 

.15 

.25 

1.50 

3.00 

3.00 

4.00 

.75 

1.00 

.30 

.85 

.50 

.20 

.30 

.20 


21  Charcoal  Borer,  club  shape,  large  $0.75 

22  Charcoal  Borer,  four-cornered,  small .50 

23  Charcoal  Borer,  with  spatula 50 

24  Charcoal  Capsules  Doz.  .20 

25  Charcoal  Crucibles  Doz.  .20 

26  Charcoal  Holder,  with  platinum  wire  and  shield   2.25 

27  Charcoal  Saw .35 


302 


THE  DENVER  FIRE  CLAY  COMPANY. 


72 


53 


No. 

28  Charcoal  squares Doz.     $1.00 

29  Charcoal  Square  Covers "  .40 

30  Charcoals,  natural "  .50 

31  Charcoals,  artificial "  .50 

32  Clay  Capsules "  .20 

33  Clay  Crucibles  "  .20 

34  Clay  Cylinder 25 

35  Cold  Chisels  25 

36  Cupel  Holder,  with  two  moulds  and  one  stamp 1.50 

37  Dishes,  of  porcelain,  three  in  set Set        .25 

38  Dropping  Bottle 35 

39  Dropping  Tube 05 

40  Files,  round  and  triangular,  with  handles .30 

41  Forceps,  see  page  164. 

48  Forms  of  boxwood,  for  paper  cylinders .15 

49  Funnel,  of  glass,  small  set  of  three 20 

51  Funnel,  of  tin,  japanned .25 

53  Hammers,  Plattner's,  polished  wire  handle .60 

54  Hardness  Scales 2.00 

55  Holder,  for  chimney  and  funnel 1.50 

56  Holder  for  evaporating  dish,  with  triangle 2.00 

57  Holder,  for  platinum  wire .50 

58  Holder,  same  as  57,  with  six  wires 1.25 

59  Ivory  Spoon 20 

60  Knife 25 

61  Lamp,  for  alcohol,  glass   .50 

62  Lamp,  for  alcohol,  brass   .50 

63  Magnet,  Horseshoe    25 

64  Magnet,  straight,  with  chisel  edge .35 

65  Magnifiers,  see  page  218. 

70  Matrasses,  with  bulb Doz.         .30 

72  Matrass  Holder 30 

73  Mixing  Capsule,  brass 20 

74  Mixing  Capsule,  brass,  nickel-plated .30 

75  Mixing  Capsule,  German  silver .35 

76  Mixing  Capsule,  horn .15 

77  Mixing  Spatula,  steel 25 

78  Mortar,  agate,  with  pestle 1 .75 


THE  DENVER  FIRE  CLAY  COMPANY. 


303 


104 


107 


115 


No. 

79  Mortars,  steel,  Plattner's  Diamond,  small $3.60 

80  Mortars,  steel,  Plattner's  Diamond,  large 5.50 

81  Mortars,  steel,  Leed's  form 2.00 

82  Moulds,  for  charcoal  square  and  covers   4.50 

83  Moulds,  for  charcoal  capsules 75 

84  Moulds,  for  charcoal  crucibles .50 

85  Moulds,  of  brass,  for  clay  crucibles 4.00 

86  Moulds,  of  boxwood,  for  clay  crucibles 1.25 

87  Moulds,  of  boxwood,  for  clay  capsules .75 

88  Nippers,  flat-nose  pliers   .50 

89  Platinum  Foil Market  Price      .... 

90  Platinum  Wire "  

91  Platinum   Crucible 

92  Platinum  Spoon .... 

93  Platinum  Tip,  for  blow  pipe 

94  Pliers,  for  assay  buttons,  straight  and  bent .50 

95  Scale,  Plattner's,  of  ivory,  for  silver  beads 3.00 

97  Scissors,  for  lamp .50 

98  Shears,  for  cutting  metal 1 .00 

99  Silver  Foil,  chem.  pure Oz.       1.25 

100  Soda  Papers ....Box        .20 

101  Stirrers,  of  glass : Doz.         .25 

102  Streak  Plate 20 

103  Test  Lead  Measure \ 25 

104  Test  Lead  Sieve .50 

105  Test  Tubes . .Doz.        .25 

106  Test  Tube  Holder 15 

107  Test  Tube  Support 45 

108  Tin  Box,  japanned,  for  charcoal  squares .75 

109  Tin  Box,  japanned,  for  capsules  and  crucibles .75 

111  Tin  Trays,  japanned,  for  charcoal .45 

112  Tin  Trays,  japanned,  for  dirt 35 

113  Tubes,  open  at  both  ends,  hard  glass Doz.        .30 

114  Tubes  for  arsenic  reduction .10 

115  Wash    Bottle    75 

116  Watch  Glass,  2-inch Doz.        .35 

117  Watch  Glass  Clip 25 

118  Wicks,  for  Lamp Bundle        .10 

119  Frame,  for  18  reagents .60 

120  Frame,  with  18  cork-stoppered  bottles,  labeled 1.50 

121  Frame,  with  18  glass-stoppered  bottles,  labeled  2.00 

122  Filling  18  bottles  with  reagents 2.00 


304 


THE  DENVER  FIRE  CLAY  COMPANY. 


PART  II 

Special  Chemical  Apparatus  for 
Analytical  Work 


2003 


2004 


2009 


2008 


No.  A.     ARSENIC    DETERMINATION. 

2001  Marsh's  Apparatus,  with  stopcock,  on  polished  wooden  support $  2.20 

2002  Plain  Marsh  U  Tube 40 

2003  Fresenius'  Arsenic   Apparatus : 1.00 

2004  Berzelius'  Arsenic  Apparatus 1.00 

2005  Porcelain  Test  Plates,  for  arsenic  apparatus .20 

2006  Reduction  Tubes,  form  a,  b,  c,  d Each,  $0.05;  Doz.        .30 

B.     CARBONIC   ACID    DETERMINATION. 

2007  Peterson  &  Palmquist's  Apparatus  for  CO2  in  air 50.00 

2008  Ruedorff's  Apparatus  for  CO2  in  illuminating  gas 10.00 

2009  Scheibler's  Calcimeter,  for  CO2  in  bone  black 25.00 

2010  Scheibler's,  for  CO,  in  saturation  gases 30.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


305 


2010a 


2011 


B.     CARBONIC    ACID    DETERMINATION. 


No. 

2010a     Winkler's,  for  CO2  in  atmospheric  air  and  mines $20.00 

C.     COLORI METRIC  DETERMINATION. 

2011  Leed's  Color  Comparator.    For  quantitative  analysis  of  substances  in  solu- 

tions, with  prism 15.00 

2012  Color  Glasses.    For  Leed's  Comparator Doz.       2.50 


2013 


2013  Hehner's  Colorimeter.    For  estimating  ammonia  in  water;   consisting  of  2 

graduated  cylinders,  with  stopcocks $4.00 

2014  Gallenkamp-Heele's  Colorimeter.    With  direct  scale  of  percentage;   easily 

and  quickly  adjusted  and  permitting  very  accurate  readings,  adapted 

for  sugar  factories,  dyeing  establishments,  etc 85.00 

2015  Stammer's  Colorimeter.    For  testing  color  in  sugar  analysis;  latest  form. .     60.00 

2016  Wolff's  Colorimeter.     On  iron  base.     This  valuable  instrument  serves  to 

determine  aniline  dyes,  indigo,  cochineal,  dye  woods,  bone  black, 
salicylic  acid  in  absorbent  cotton,  smallest  traces  of  copper,  zinc,  lead 
and  chlorine,  ammonia  and  nitrous  acid  in  water,  also  for  making 
colored  indicators,  etc 80.00 

2017  Duboscq-Soleil's  Colorimeter 80.00 

2018  Lovibond's  Tintometer,  with  a  complete  set  of  470  standard  glasses 300.00 

2019  Stoke's  Color  Comparator,  complete 15.00 


306 


THE  DENVER  FIRE  CLAY  COMPANY. 


CEMENT  TESTING  APPARATUS 

(Physical) 


2020c 


2020 


2020d 


2020a 


2020b 


No. 

2020 


2020a 

2020b 
2020c 
2020d 
2020e 

2020f 


Cement  Testing  Machine,  Automatic,  Fair-bank's.  This  machine  is  recog- 
nized as  the  standard.  Capacity,  1,000  pounds;  size,  12x24  inches. 
Price,  with  one  Standard  Briquette  mould $110.00 

Briquette  Moulds,  of  brass,  forming  the  Standard  Briquette  of  the  American 

Society  of  Civil  Engineers Each      4.00 

Briquette  Mould,  gang,  for  four  15.00 

Glass  Plate,  of  heavy  glass  with  smooth  edges,  size  24  x  24  inches 8.00 

Pans,  of  galvanized  iron,  with  handle,  24  x  24  x  3  inches 2.00 

Vicat's  Identing  Apparatus,  to  show  the  time  of  setting  of  cement,  with 

scale  graduated  in  millimeters  and  fractions  of  the  inch 30.00 

Gilmore's  Needles,  consisting  of  steel  needle,  1-12  inch  in  diameter,  loaded 
with  weight  of  %  pound;  and  another  needle  1-24  inch  in  diameter, 
loaded  with  weight  1  pound.  With  block 5.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


307 


2024 


2025 


2026 


2027 


D.     DISTILLING   APPARATUS. 


No. 

2021  Alembic  Salleron,  or 

made  of  copper, 

2022  Distilling  Apparatus, 

2023  Distilling  Apparatus, 

2024  Distilling  Apparatus, 

2025  Distilling  Apparatus, 

40  cc.  capacity. 

2026  Distilling  Apparatus, 

2027  Distilling  Apparatus, 


Monitor  Still,  for  testing  wine  and  spirituous  liquids, 

complete  in  box $10.00 

Regnault's,  for  fractional  distillation 15.00 

for  fractional  distillation  under  diminished  pressure..  3.00 

Hempel's,  for  fractional  distillation,  filled  with  beads..  2.00 
Bruhl's,  for  distillation  in  vacuo,  with  5  cylinders  of 

10.00 

Fuch's  Receiver,  for  distillation  in  vacuo 3.50 

Gautier's  Receiver,  for  distillation  in  vacuo  4.00 


308 


THE  DENVER  FIRE  CLAY  COMPANY. 


2031 


E.  ELECTROLYTIC  APPARATUS, 
a.  PROF.  A.  W.  HOFMANN'S  LECTURE  APPARATUS. 


No. 


2031       Apparatus  for  the  electrolytical  decomposition  of  Hydrochloric  Acid,  Water 
and  Ammonia. 

2031a  The  V-shaped  tube  with  platinum  electrodes   $3.00 

2031b  The    support    .  .  1.50 


2032 

2032  Apparatus  to  demonstrate  that  Hydrochloric  Acid  is  produced  by  the  com- 
bination of  1  vol.  of  Chlorine  with  1  vol.  of  Hydrogen.  The  apparatus 
consists  of  tube,  2  tube  supports,  chloride  of  calcium  jar,  cylinder 
with  enlarged  top,  and  decomposing  cell. 

2032a  The  tube  and  cylinder    $3.50 

2032b  The  tube  supports  only  2.50 

2032c  The  decomposing  cell  only    4.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


309 


2033 


2034 


2035 


2036 


No. 
2033 


Apparatus  to  determine  the  quantity  of  Hydrogen  in  1  vol.  of  Hydrochloric 
Acid. 


2033a  The  tube  with  two  glass  stopcocks $3.00 

2033b  The    support    2.50 

2034  Apparatus  to  demonstrate  that  3  vols.  of  Hydrogen  combine  with  1  vol.  of 

Nitrogen  in  2  vols.  of  Ammonia. 

2034a  The  tube  with  two  glass  stopcocks 4.00 

2034b  The    support    2.50 

2035  Apparatus  to  demonstrate  that  Water  consists  of  2  vols.  of  Hydrogen  and  1 

vol.  of  Oxygen. 

2035a  The  graduated  tube  with  platinum  electrodes  7.00 

2035b  The  tube,  ungraduated,  with  platinum  electrodes   5.50 

2035c  The  support  with  binding  screws 3.00 

2036  Apparatus  for   the    simultaneous    electrolytical    decomposition    of   Water, 

Hydrochloric  Acid  and  Ammonia. 

2036a  The  graduated  tube  with  platinum  electrodes   6.50 

2036b  The  graduated  tubes  with  carbon  electrodes  Each      5.00 

2036c  Supports  with  binding  screws   Each       3.00 


310 


THE  DENVER  FIRE  CLAY  COMPANY. 


2038 


2039 


2040 


No. 

2037  Apparatus  to  demonstrate  that  Hydrogen  and  Oxygen  are  combined  in  the 

same  proportions  as  they  are   liberated  from  Water  by  electrolysis. 

2037a              Tubes  with  two  glass  stopcocks Bach  $4.00 

2037b              The  middle  tube  with  glass  stopcock  3.00 

2037c              The  supports    Each  2.50 

2038  Apparatus,  Lecture   Eudiometer. 

2038a  The  Eudiometer  graduated  in  cubic  centimeters   6.00 

2038b  The  support 2.50 

2039  Apparatus  to  demonstrate  that  Oxygen  has  the  same  volume  as  the  Car- 

bonic Acid  and  the  Sulphurous  Acid  formed  from  it. 

2039a  The  tube 6.00 

2039b  The    support 2.50 

2040  Apparatus  to  demonstrate  that  by  uniting  Hydrogen  and  Oxygen  into  Water 

a  condensation  of  one-third  takes  place. 

2040a  The  tube  complete  with  jacket 4.50 

2040b  The  support 3.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


311 


No. 

2041 
2042 
2043 

2044 
2045 


2041  2042  2043  2044 

b.     GENERAL    ELECTROLYTIC   APPARATUS. 


2045 


Classen's  Voltameter  for  quantitative  analysis.     Complete $10.00 

Measuring  Voltameter.    Tube  of  50  cc.  divided  into  *£°,  with  support 9.00 

Skidmore's  Voltameter.    For   students,   as   used   in   Philadelphia   Normal 

School   4.50 

Roscoe-Schorlemmer's  Apparatus  with  carbon  electrodes.     For  the  produc- 
tion of  chlorine  detonating  mixture,  with  support 5.00 

Electrolytic  Tube  for  decomposition  of  water 1.50 


2046 


2046a 


2047 


2048 


2046  Electrolytic  Tube  for  decomposition  of  water.    U  tube,  with  glass  stoppers 

etc $2.00 

2046a     Electrolytic  Tube,  Skidmore's.    For  decomposition  of  water,  tube  only. . .  2.50 

2047  Electrolytic  Apparatus  for  generation  of  hydrogen 4.00 

2048  Electrolytic  Apparatus  for  generation  of  oxy-hydrogen 4.00 


312 


THE  DENVER  FIRE  CLAY  COMPANY. 


The  D.  F.  C,  Co.  Electrolytic  Apparatus 

For  the  Determination  of  Lead,  Copper,  Etc. 


2050 
Code  Word,  "Elec." 


No. 

2050       Electrolytic  Apparatus,  D.  F.  C.  Go's. 

The  time  heretofore  required  to  make  electrolytic  assays,  which,  in  the  present 
day,  is  unavailable  owing  to  the  large  amount  of  work  required  of  chemists  daily,  has 
retarded  the  more  general  acceptance  of  this  means  of  metal  determination  in  the 
commercial  laboratory.  We  illustrate  above  an  apparatus  designed  on  the  lines  sug- 
gested to  us  by  Albert  H.  Low,  B.  S.,  author  of  Technical  Methods  of  Ore  Analysis, 
which  overcomes  this  objection  and  brings  electrolysis,  in  the  determination  of  lead, 
copper  and  iron  in  the  low  grade  ore,  within  the  field  of  commercial  usefulness.  This 
increased  speed  of  deposition  is  accomplished  by  imparting  to  the  solution  a  regular 
movement  around  the  electrodes  by  means  of  glass  propellers,  the  forced  contact  result- 
ing in  a  much  more  rapid  reduction  in  the  metallic  salt  density  of  the  electrolyte  and 


THE  DENVER  FIRE  CLAY  COMPANY. 


313 


2050 


consequently  a  complete  deposition  in  a  shorter  period  of  time.  Where  heretofore  it 
has  required  from  three  to  twelve  hours,  our  apparatus  accomplishes  equal  results  in 
from  forty  minutes  to  one  hour. 

The  improvements  in  the  design  of  our  apparatus  over  that  of  other  types  can 
be  readily  noted  from  the  illustrations.  A  brief  description  follows: 

The  apparatus  consists  essentially  of  a  hardwood  cabinet,  in  the  base  of  which 
are  adjustable  stools,  one  for  each  unit,  on  which  the  beaker  containing  the  assay  stands. 
The  two  uprights  at  the  ends  carry  the  cross  arm  through  which  the  propellers  are 
suspended  and  which  furnishes  their  bearing;  the  poles  for  the  electrodes  are  also 
fixed  to  this  cross  arm.  On  one  end  is  seen  the  motor  for  transmitting  power  to  the 
propellers,  and  operated  itself  with  dry  batteries.  The  ammeter,  voltmeter  and  rheostat 
of  the  usual  type  are  rigidly  fastened  to  the  top  piece.  The  whole  is  compact,  self- 
contained  and  substantially  made. 

In  connection  with  this  apparatus  we  advise  the  use  of  storage  batteries  to 
furnish  the  necessary  current,  for  the  reasons  that  their  freedom  from  obnoxious  fumes, 
the  fact  that  component  parts  require  no  renewal  and  the  great  constancy  of  the 
potential  difference  which  they  furnish  makes  them  particularly  suited  for  their  work. 

METHOD  OF  OPERATION. 

After  the  dilution  of  the  electrolyte  to  the  proper  point  the  beaker  is  placed  on 
the  stool  and  the  electrodes  fixed  to  their  poles;  the  stool  is  then  adjusted  with  wooden 
screw  to  immerse  the  electrodes  and  propeller.  The  motor  is  then  started  and  current 
through  rheostat  turned  in.  After  complete  deposition  the  cathode  is  loosened  and 
drops  quietly  into  the  beaker;  the  stool  is  then  lowered  by  loosening  the  retaining 
screw,  and  after  clearing  the  propeller  the  beaker  is  removed  from  the  stool,  when  the 
cathode  is  taken  out,  washed  in  water  and  alcohol,  dried  and  weighed. 

Its  simplicity,  mechanical  design  and  effectiveness  should  appeal  strongly  to  any 
one  in  the  market  for  electrolytic  laboratory  equipment.  Made  in  6,  12  and  24  units; 
larger  number*  of  units  to  order.  Prices  upon  application. 

Methods  for  the  electrolytic  estimation  of  lead  and  copper  and  other  valuable 
information  on  the  use  and  care  of  electrolytic  equipment  furnished  upon  request. 


314 


THE  DENVER  FIRE  CLAY  COMPANY. 


2051 


No. 

2051 


2052 


2052a 


2053 


2054 


2055 
2056 


2057 


2052a  2053  2054 

F.     EXTRACTION    APPARATUS. 

Extraction  Apparatus,  Soxhlet's.     With  bulb  in  side  tube. 
Capacity  2  4  6  oz. 


2055 


2056 


Each 


$1.20       1.50 


2.00 


Extraction  Apparatus,  Soxhlet's.     Complete  with  flask  and  condenser. 
Capacity  2  4  6  oz. 


Each 


$2.25       2.50 


3.50 


Extractor,  Soxhlet-Baird's,  with  stopcock  of  large  bore,  as  used  in  sugar 

laboratories   $2.00 

Special  flasks  for  same,  each  .50 

Extraction  Apparatus,  Soxhlet-Szombathi's.     All  parts  fitted  by  ground  joints. 
Capacity  2  4  6  oz. 


Each 


$4.00       5.00 


6.00 


Extraction   Apparatus,  Schwarz's.     Joints  to  be  closed  by  mercury  seal. 
Capacity  4  8  oz. 


Each               $2.00         2.75 
Extraction  Apparatus,  Thorn's $2.00 

Extraction  Apparatus,  Wiley's.  Very  simple  and  effective,  dispensing  with 
corks  and  other  stoppers;  permits  a  double  weighing  both  of  residue 
and  extracted  matter.  Complete  with  nickel-plated  metal  condenser 
and  porcelain  Gooch  crucible,  fitted  to  tube  with  ground  flange,  to 
insure  close  connection. .  5.00 


Extraction  Shells,  seamless,  of  fat  free  paper. 
Size  60x26       80x22       90x19 


80x33      94x33  mm. 


Box  of  25 


$1.75         1.75 


1.75 


2.00 


2.50 


THE  DENVER  FIRE  CLAY  COMPANY. 


315 


2061  2062a 

G.     GAS    ANALYSIS    APPARATUS. 


No. 
2061 


Gas  Apparatus,  Orsat-Muencke's.    For  analysis  of  CO.,,  CO  and  O,  consist- 
ing of  3  absorption  cylinders,  with  copper  spirals,  stopcock,  tube  with 

3- way  stopcock,  etc.,  complete  in  portable  wooden  case $25.00 

2062       Gas  Apparatus,  Orsat-Muencke's,  modified,  with  large  universal  stopcock, 

dispensing  with  4  smaller  ones 35.00 

2062a  Gas  Apparatus,  according  to  Constanz  Schmitz.  This  latest  and  most  im- 
proved form  of  gas  apparatus  has  the  advantage  over  all  other  similar 
apparatus  now  in  use,  that  it  can  be  easily  and  safely  carried  from  one 
place  to  another  and  yet  is  always  ready  for  instantaneous  use,  as, 
once  rigged  up,  it  never  needs  to  be  taken  apart,  neither  for  emptying 
nor  filling  the  absorption  tubes. 

Price  of  apparatus  with  2  pipettes 35.00 

Price  of  apparatus  with  3  pipettes 45.00 


2063 


2063 

Gas  Drying  and  Washing  Apparatus,  Glaser's.  Consisting  of  2  gas  washing 
bottles,  2  CaCl2  cylinders,  U  tube  with  3  bulbs,  glass  tube  with  stop- 
cock, glass  and  rubber  tubing,  pinchcocks  and  support,  complete. .  . . 


$9.00 


316 


THE  DENVER  FIRE  CLAY  COMPANY. 


2064 


2065 


No. 

2064  Gas  Drying  and  Washing  Apparatus,  Bennert's,  complete  on  wooden  sup- 

port   $10.00 

2065  Gas  Apparatus,  Lindemann's,  for  determining  Oxygen  in  atmospheric  air 

and  mines.     Complete  in  case 18.00 

2066  Gas  Apparatus,  Thoerner's,  for  absorption  and  direct  analysis  of  gases  dis- 

solved in  water.     On  wooden  base 5.50 


2067 


2068 


2069 


2067  Gas  Apparatus,  Lunge's  Volumeter.     For   analysis  of  soluble  substances, 

like  manganese,  chloride  of  lime,  animal  charcoal,  calcium  carbonate, 
urea,  etc.    Complete  with  heavy  rubber  tubing $15.00 

2068  Gas  Apparatus,  Lunge's  Volumeter.      For    analysis    of    saltpetre,    nitrose, 

nitrocellulose  and  dynamite,  complete 20.00 

2069  Gas  Apparatus,  Lunge's  Universal  Volumeter.     Complete  with  heavy  rub- 

ber tubing 15.00 

2070  Gas  Apparatus,  Thoerner's.    For  quick  control  of  the  working  of  gas  gen- 

erators . .  1 5.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


817 


n 


2073 


2077 


No. 


2071 

Gas  Burette,  Bunte's.     Graduated,  with,  two  stopcocks  

$  6.00 

2072 

Same,  complete  with  support  and  aspirator  bottle  

9.00 

2073 

Gas  Burette,  Elliott's.     For  furnace  and  illuminating  gases,  complete  as 

per  illustration  

15.00 

2074 

The  two  burette  parts  only  

12.00 

2075 

The  explosion  burette  only  

8.00 

2076 

Gas  Burette,  Hempel-Winkler's.    With  glass  stopcocks,  set  of  two  complete 

on  lead  charged  base  

7.50 

2077 

Gas  Burette,  Winkler's.     Complete  with  support  

12.00 

2078 

The  measuring  tube  and  filling  tube  only  

8.00 

2079 

The  measuring  tube  only  

6.00 

318 


THE  DENVER  FIRE  CLAY  COMPANY. 


1 


2080 


2081      2082      2983        2084 


2085          2086 


2087 


No. 

2080 

2081 


2082 


2083 


2084 


2085 
2086 

2087 


Gas  Burette,  Lunge's,  50  cc.,  without  support $4.00 

Gas  Measuring  Tubes,  Bunsen's. 

Capacity         25  50         100         200        300  cc. 

Grad.  1-5         1-5          %  1-1         1-1° 


Each 


$0.60       1.00       1.30       1.60 


2.50 


Gas  Measuring  Tubes,  Bunsen's.     With  stopcock. 
Capacity  50       100  cc. 

Grad.  1-10       1-5° 


Each 


$2.00       2.50 


Gas  Eudiometer,  Bunsen's.     With  platinum  electrodes. 

Capacity        300        500        700        800mm.        50  cc. 


100  cc. 


Each 


$1.60       2.00        2.50 


3.00 


1.80 


2.25 


Gas  Eudiometer,  Mitscherlich's.     With  stopcocks  and  platinum  electrodes. 
Capacity        50        100  cc. 
Grad.  1-5          1-5° 


Each           $3.00        3.50 
Gas  Eudiometer,  Ure's.     U  form,  with  platinum  electrodes 2.25 


Gasometer  Tube,  Baird's,  with  2-way  stopcock,  capacity,  100  cc.  graduated 
to  48  cc.    , 


2.50 


Gasometer  Tube,  Mendelson's,  with  3-way  stopcock,  capacity,  100  cc.,  grad- 
uated to  48  cc.    .  3.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


319 


2090 


2091 


No. 

2090  Gas  Pipettes,  Hempel's.     Absorption,  simple,  for  solids,  mounted $3.00 

Glass  part,  alone 1 .50 

2091  Gas  Pipettes,  Hempel's.     Absorption,  simple,  for  liquids,  mounted 3.00 

Glass   part,  alone 1 .50 


2092 


2093 


2094 


2092  Gas  Pipettes,  Hempel's.    Absorption,  compound,  for  liquids,  mounted $4.00 

Glass  part,   alone 2.25 

2093  Gas  Pipettes,  Hempel's.    Absorption,  compound,  for  solids,  mounted 4.00 

Glass  part,  alone 2.25 

2094  Gas  Pipettes,  Hempel's.    Ethylene,  bulb  filled  with  glass  beads,  mounted. .  4.00 

Glass  part,  alone 2.25 


320 


THE  DENVER  FIRE  CLAY  COMPANY. 


2095 


2096 


2097 


No. 
2095 

2096 
2097 


Gas  Pipettes,  Hempel's.  Explosion,  mounted $6.50 

Glass  part,  alone 4.00 

Gas  Pipettes,  Hempel's.  Explosion,  with  leveling  bulb 6.50 

Glass  part,  alone 4.00 

Gas  Pipettes,  Hempel's.  Hydrogen,  mounted 5.00 

Glass  part,  alone 2.75 


2098 


2099 


2100 


2098  Gas  Pipettes,   Hempel's.     For  estimation  of  methane,  with  platinum  spiral  $6.00 

Glass  part,  alone 2.50 

2099  Hempel's  Palladium  Tube.    For  absorption;  filled  with  palladium  black...  2.50 

2100  Gas  Absorption  Tube,  Bunsen's,  straight,  graduated 1.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


321 


No. 

2101 
2102 
2103 
2104 
2104a 


2101 


2102 


2103 


2104 


2104a 


Gas  Absorption  Tube,  Bunsen's.     With  bulb,  graduated $1.25 

Gas  Absorption  Tube,  Babo's.    Filled  with  glass  beads 1.25 

Gas  Absorption  Tube,  E m me rl ing's.     Filled  with  glass  beads 1.50 

Gas  Generator,  consisting  of  flask,  funnel  tube,  and  delivery  tube.    Pint  size  .60 

Gas  Generator,  as  above,  with  tubes  ground  into  neck.    Pint  size 1.00 


2105 


2106 


2107 


2108 


2105  Gas  Generator,  consisting  of  generating  bottle,  funnel  tube,  lead  basket  and 

delivery  tube  with  pinchcock.     Quart  size $2.00 

See,  also,  Gas  Generators,  page  274. 

2106  Gas  Bags,  of  best  rubber,  oval. 

Capacity         123  5  gal. 


Each 


$1.25       1.75       2.00 


2.75 


2106a    Brass  Nozzle  and  Stopcock,  for  any  bag 1.25 

2107  Gas  Holder,  Berzelius'.    Entirely  of  glass,  capacity  1  gal 9.00 

2108  Gas  Holder,  Mitscherlich's.    Of  glass  with  brass  fittings,  capacity  3  gals..     20.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


2111a 


2112 


2111b 


2113 


No. 

2109  Gas  Holder,  Pepy's.    Of  heavy  zinc,  improved  form,  capacity  10  gals $20.00 

2110  Gas  Regulator,    Reichert's 2.50 

2111  Gas  Regulator,   Reichert's.     With  stopcock 4.00 

2111a  Gas  Regulator,  according  to  Roux,  without  the  use  of  mercury  or  glass  in 

its  construction.    Made  in  2  sizes;  small,  10  in.,  $8.00;  large,  12  in.. . .  10.00 

2111b  Gas  Regulator,  Greenman's.    Made  entirely  of  steel   (a  special  feature)...  12.50 

2112  Gas  Distributors.     With  three  stopcocks  and  center  light 4.00 

2113  Gas  Collecting  Tubes.    With  stopcock  at  each  end,  capacity  about  250  cc.. .  3.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


323 


2114 

No. 

2114 

2114a 

2115 
2116 


2114a 


2116 


Gas  Collecting  Tubes.    With  bulb,  stopcock  at  each  end $3.00 

Gas    Pressure    Regulator,    MurrilPs.     Latest   and   most    convenient   form, 

for  use  with  a  thermostat 8.00 

Gas  Washing  Bottles,  Allihn's.     500  cc 1.75 

Gas  Washing  Bottles,  Bunsen's.    With  tube  and  rubber  connections. 
Size          7  9  in. 


Each    $0.60 


.75 


2117 


2118 


2119 


2117  2118 

Gas  Washing  Bottles,  Cloez's. 

Capacity        8  16  oz. 


2119 


Each  $1.00  1.25 

Gas  Washing  Bottles,  Drechsel's,  with  tubes  ground  into  neck. 

Capacity        8  16  oz. 

Each  $1LOO"  1.25 

Gas  Washing  Bottles,  with  two  tubes  ground  into  neck,  and  glass  stopper. 

Capacity        125  250  500  grms. 


Each 


$1.00 


1.25 


1.50 


324 


THE  DENVER  FIRE  CLAY  COMPANY. 


2126 


2125a 


2130a 


2129 


H.     IRON    AND   STEEL   ANALYSIS. 
No. 

2121  Dudley's  Apparatus.     For  determination  of  sulphur  in  iron  and  steel  by 

bromine  method   $  3.50 

2122  Same  with  improved  bromine  holder 6.00 

2123  Bubble  Tubes  for  above  apparatus .50 

2124  Dudley's  Complete  Sulphur  Determination  Apparatus.     With  support  and 

clamps 14.00 

2125  Same  as  above,  glass  parts  only 10.00 

2l25a     Goetz's  Tube,  for  phosphorus  determination 1.25 

2126  Meyer's  Sulphur  Determination  Apparatus 2.75 

2127  Norris'  Sulphur  Determination  Apparatus.     Either  to  be  used  for  Elliott's 

iodine,  or  Brown's  potassium  permanganate  method 2.25 

2128  Uehling's   Manganese   Determination   Apparatus 5.00 

2129  Jones'  Reductor,  complete  on  stand 20.00 

2130  Carbon  Tubes,  Eggertz',  for  the  calorimetric  determination  of  Carbon  and 

Manganese  in  steel. 

25  cc.  1-10  50  cc.  1-10 

2130a  Straight,  set  of  2   $2.50  $3.00 

Straight,  set  of  4    5.00  6.00 

2130b  Bent  ends,  set  of  2  2.75  3.50 

Bent  ends,  set  of  4  5.50  7.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


325 


2131 


2131 


1.      MILK  ANALYSIS. 


No. 

2131 


Babcock's  Milk  Tester.    With  directions. 

(a)  Four-bottle  test    

(b)  Six-bottle  test    

(c)  Eight-bottle  test  

(d)  Ten-bottle    test    

Note: — With  each  machine  is  included  a  full  set  of  milk  bottles,  one 

skim  milk  bottle,  pipette,  acid  measure  and  acid. 

Extra  Milk  Bottles,  10% Each,  $0.15;  Doz. 

Extra  Cream  Bottles,  30%    "         .20;  Doz. 

Extra  Cream  Bottles,  50%   "         .25;  Doz. 

Extra  Skim  Milk  Bottles,  double  neck  "         .75;  Doz. 

Extra  Measures,  17.5  cc "         .10;  Doz. 

Extra  Pipettes,  17.6  cc "         .15;  Doz. 

Lactoscope,  Feser's.     Put  up  in  fine  case,  with  directions 

Pioscope,  Heeren's.    Testing  by  color  of  the  milk,  with  directions 

Milk  Absorbing  Paper,  Adams'.    Absolutely  fat  free,  in  strips  6.5x56  ctm., 
50  in  a  package Package 

Hofmeister's  Dishes;  for  evaporating,  of  very  thin  glass Doz. 

Cream  Tubes.     Giving  direct  percentage  of  cream 

Creamometer,  Chevalier's.     Giving  direct  percentage  of  cream,  with  red 
lines  


2137 
2138 

2139 


Lactobutyrometer,  Marchand's.     On  foot 

Lactobutyrometer,  Soxhlet's.     For  the  areometric  determination  of  fat  in 
milk,  complete  with  two  lactometers,  instructions  and  tables 

Holt's  Apparatus  for  testing  human  milk  

See,  also,  Hydrometers  for  Milk  on  page  206. 


$  8.00 
10.00 
11.00 
12.50 


1.50 
2.00 
2.50 
7.50 
1.00 
1.50 

3.50 
.50 

2.50 

1.25 

.50 

1.00 
1.00 

30.00 
2.50 


326 


THE  DENVER  FIRE  CLAY  COMPANY. 


2141 


2143 


2148 


2142  2147  2147a 

J.  NITROGEN  DETERMINATION. 


2149 


No. 

2141 

2142 

2143 

2144 

2145 

2146 

2147 

2147a 

2148 

2149 
2150 


Kjeldahl's  Condensers.     Of  copper,  tin-lined,  6  coils  of  pure  block  tin 

Kjeldahl's  Digesting  Shelf.     Square,  with  6  burners  and  stopcock 

Kjeldahl's  Connecting  Bulb  Tubes    Each 

Kjeldahl's  Digesting  Flasks.     Capacity  6  oz Each,  $0.30;  doz. 

Kjeldahl's  Distilling  Flasks.    Capacity  16  oz Each,      .30;  doz. 

Bunte's  Nitrometer.     100  cc.  1-5 

Bunte's  Nitrometer.     Improved  form 

Franke's    Nitrometer    

Lunge's   Nitrometer.     For   determination   of  nitrogen   in   saltpetre,   nitro- 
glycerine, etc.;  graduated  50  cc.  in  1-10°,  without  support 

Schiff's  Nitrometer,  complete  as  per  sketch 

Horn's  Nitrometer.    For  determining  N  in  gunpowder,  with  leveling  tube. . 


$25.00 

18.00 

.40 

3.00 

3.00 

6.00 

7.50 

8.00 

6.00 
6.00 
7.50 


THE  DENVER  FIRE  CLAY  COMPANY. 


327 


2152 


2153 


2156 


2156a 


K.     SPECIFIC  GRAVITY  DETERMINATION. 


No. 

2151  Bunsen's,   for   gases    

2152  Chancel's,  for  gases 

2153  Greiner's,  for  liquids  and  solids. 

2154  Nicol's,  for  liquids  

2155  Nicol's,  for  solids   

2156  Schumann's,  for  cement 

2156a  Le  Chatelier's,  for  cement  .... 


$1.50 

4.00 

5.00 

.50 

.60 

2.25 

2.00 


2157 


2160 


L.     SOIL  ANALYSIS. 

2157  Knop's,  cylinder  with  stopcocks $12.00 

2158  Noebel's,  complete  on  stand 10.00 

2159  Noebel's,  the  four  glass  parts  only 4.00 

2160  Schultz's,  conical  form 2.50 


328 


THE  DENVER  FIRE  CLAY  COMPANY, 


2163 


2164 


M.     SPECTRUM  ANALYSIS. 


No. 

2161  Spectroscope,  pocket  instrument,  with  adjustable  slit $14.00 

2162  Spectroscope,  as  above,  with  comparison  prism 20.00 

2163  Spectroscope,  for  schools,  with  flint  glass  prism  of  60°  fixed  to  a  brass 

plate.  The  telescope  has  an  aperture  of  20  mm.,  143  mm.  focal  dis- 
tance, magnifying  power  five  times.  The  collimeter  has  the  same 
dimensions  and  micrometer  screw,  dispersion  4°.  Complete  with 
scale  tube  and  comparison  prism 50.00 

2164  Spectroscope,   Kirchoff-Bunsen's,  with  covered  flint  glass  prism,  two  tele- 

scopes of  22  mm.  aperture  and  182  mm.  focus;  scale  tube,  adjustable 
slit  and  comparison  prism;  observation  telescope  movable  by  micro- 
meter screw.    Complete  with  universal  holder,  as  shown  in  sketch. . . .   100.00 
Larger  Spectroscopes  quoted  on  application. 

2165  Spectrum  Bottles,  with  parallel  sides,  stoppered,  25x8  mm.,  capacity  2  cc. 

each   40 

2166  Spectrum  Bottles,  square,  long  shape,  ground  edges. 

Length  5  10  15  cm. 

Each  $0.50  .60  .70 


2167  2168 

2167  Spectrum  Tubes,  filled  with  gases $2.00 

2168  Spectrum  Tubes,  with  two  stopcocks,  for  self-filling 3.50 

2169  Spectrum  Charts,  small,  plain 40 

2169a     Spectrum  Charts,  small,  colored 75 

2170  Spectrum  Charts,  large  3.50 


THE  DENVER  FIRE  CLAY  COMPANY. 


329 


No. 
2171 


2172 
2173 


2174 


2175 
2176 
2177 
2178 


2179 


2179a 


2180 


2181 


2182 
2183 
2184 


2171 

\  '  •. 

Polariscope,  Schmidt  &  Haensch's,  half  shade,  of  latest  construction,  with 
new  reading  arrangement  and  protecting  cap  for  the  wedge  compensa- 
tion on  tripod  stand. 

(a)  For  100  and  200  mm.  tubes $190.00 

(b)  For  100,  200  and  400  mm.  tubes 210.00 

Polariscope,  with  triple  field  of  vision,  instead  of  half  shade,  additional  . . .     40.00 
Polariscope,  Schmidt  &  Haensch's,  half  shade,  with  double  quartz  compen- 
sation, of  latest  construction  with  Lippich's  polarizer,  new  reading  ar- 
rangement, and  protecting  cap  for  the  wedge  compensation,  on  tripod 
stand. 

(a)  For  100  and  200  mm.  tubes   270.00 

(b)  For  100,  200  and  400  mm.  tubes 290.00 

Polariscope,  with  triple  field  of  vision,  instead  of  half  shade,  additional...     40.00 

N.  B. — Instead  of  the  tripod  stand  we  furnish  the  above  instruments  also 

on  trestle  stand  (Bockstativ)  at  an  additional  cost  of 20.00 

Polariscope  Lamp,  for  gas,  nickel-plated,  with  argand  burner 8.00 

Polariscope  Lamp,  for  kerosene,  nickel-plated,  with  round  burner 8.00 

Polariscope  Lamp,  for  kerosene,  double  burner,  after  Hink 12.00 

Polarization  Tubes,  of  glass,  mounted. 

Size  50  100  200  400  mm.  long. 


Each  $3.00          3.25  3.50  4.00 

Polarization  Tubes,  of  glass,  new  style,  with  enlargement  at  end  to  receive 


the  air  bubbles. 
Size 


50 


100 


200 


400  mm.  long. 


Each  $3.25  3.50  3.75  4.00 

Polarization  Tubes,  of  metal,  mounted  and  nickel-plated. 

Size  50  100  200  400  mm.  long. 

Each  $3.25  3.50  3.75  4.00 

Polarization  Tubes,  Pellet's,  for  continuous  flow,  of  metal. 
Size  100  200  400  mm.  long. 


Each  $7.50  8.00  8.50 

Inversion  Tube,  of  glass,  with  water  jacket  of  brass. 

200    mm.    long 7.25 

Thermometer  for   same 2.50 

Glass  Covers,  for  above  tubes,     (a)  Domestic,  doz.  $1.00;  (b)  imported,  doz.       1.75 

Rubber  Washers,  for  above  tubes Doz.        .20 

Quartz  Testing   Plates,  for  adjusting  the  polariscope,  about  50°   or  100°, 

mounted     10.00 

For  other  accessories,  used  in  cane  and  beet  sugar  analysis,  such  as 
flasks,  hydrometers,  pipettes,  etc.,  see  in  first  part  of  catalogue  under 
their  respective  headings,  or  write  for  our  special  list. 


330 


THE  DENVER  FIRE  CLAY  COMPANY. 


URINE  ANALYSIS 


2185b 


2185 


2186 


2185a 


2188 


2187a 


O.     URINE  ANALYSIS. 
No. 

2185  Albumenometer,  Esbach's.    For  estimation  of  albumen  in  urine   $0.75 

2l85a    Albumenometer,  Esbach's,  on  glass  foot,  with  pointed  bottom  for  reading 

small  quantities    1 .00 

2185b     Fermentation  Tubes,  Smith's,  5  in.  high,  ungraduated 30 

2186  Saccharometer,    Einhorn's.     For   estimation   of  sugar   in  urine,   complete 

with  marked  test  tube 75 

2187  Saccharometer,  Einhorn's.    Set  of  two  with  graduated  test  tubes,  in  box..  1.50 
2187a    Horismascope,  for  detecting  albumen  by  nitric  acid 1.00 

2188  Purinometer,  Hall's.     For  estimating  the  amount  of  "Purin"  nitrogen  in 

urine,  with  directions  for  use  10.00 

2189  Urea  Apparatus,  Marshall's.     For  estimation  of  urea  in  urine   3.00 

2190  Urea  Apparatus,  Squibb's.    For  estimation  of  urea  in  urine 3.00 

2191  Urea  Apparatus,  Bartley's.    For  estimation  of  urea  in  urine 1.25 


THE  DENVER  FIRE  CLAY  COMPANY. 


331 


2192 


2194 


2196 


No. 
2192 


Urea  Apparatus,   Doremus'.     For  estimation  of  urea  by  action  of  sodium 

hypobromite   $1 .25 

2193  Urea  Apparatus,  same,  on  glass  foot  1.50 

2194  Urea  Apparatus,  Doremus'  improved.     The  1  cc.  pipette  being  connected 

with  the  ureometer  by  a  stopcock,  a  much  greater  accuracy  can  be  ob- 
tained          3.00 

2195  Urea  Apparatus,  same,  on  glass  foot 3.50 

2196  Urea  Apparatus,  Huefner's.    For  determination  of  nitrogen  in  urea 5.00 


2196a 


2197 


2198       Uricometer,  Ruhemann's,  for  the  rapid  examination  of  uric  acid  .  . 

:  $3.00 

2197       Urinometer,  Squibb's.     With  thermometer   

2.00 

2198       Urinometer,  Squibb's.     Without  thermometer    

1.00 

2199       Urinometer,  Vogel's.    1.0  to  1.06  on  one  spindle   

60 

2200       Urinometer,  Vogel's.     1.0'to  1.06  on  two  spindles   

Set       1.00 

2200a     Urinometer,  Vogel's.     1.0  to  1.06   with   thermometer 

1.50 

332  THE  DENVER  FIRE  CLAY  COMPANY. 


PART  III 

a.  ESTIMATE  OF   LABORATORY  EQUIPMENT. 

b.  OUTFITS   FOR   ASSAYERS  AND   PROSPECTORS. 

c.  SCHOOL  SETS  OF  CHEMICAL  APPARATUS. 

d.  COLLECTIONS  OF  MINERALS,  MODELS  AND  CHARTS. 

e.  SCIENTIFIC   BOOKS. 

ESTIMATE    OF    LABORATORY 

EQUIPMENT 
FOR     EIGHT     STUDENTS. 

Every  item  in  the  following  list  is  of  the  best  and  most  serviceable  material  ob- 
tainable. We  respectfully  desire  to  call  your  attention  to  the  fact  that  our  DUTY 
FREE  IMPORT  DEPARTMENT  is  conceded  to  be  superior  to  anything  of  its  kind  in 
this  country. 

LABORATORY    DESK. 

Specifications. 


3900 

Size — Top  measures  12  ft.  long  x  4  ft.  wide,  3  ft.  high. 

Construction — The  top  is  constructed  of  hardwood  strips,  dressed  to  1%  in.  thickness, 
matched  and  glued,  which  gives  hard,  smooth  working  surface  and  prevents 
warping.  The  cabinet  is  also  made  of  dressed  hardwood  and  solidly  put  together. 
The  reagent  bottle  shelves  are  divided  and  made  with  retaining  rims. 

Drawers — Each  student  is  provided  with  four  drawers  and  one  double  cupboard.  Larger 
drawers  measure  inside  10"xl6"x8"  deep.  Smaller  drawers  all  measure  inside 
8"xl6"x3y2"  deep. 

Cupboards — Cupboards  all  measure  inside  16"xl6%"xl8"  high. 

Locks — All  locks  are  masterkeyed  and  two  masterkeys  to  pass  all  locks  are  supplied 
with  each  order.  All  drawers  and  cupboards  are  therefore  accessible  to  the  in- 
structor and  each  student  can  unlock  only  his  own  section. 


3900a 

Plumbing — Desks  are  supplied  with  two  enameled  iron  sinks  16x24",  four  nickel-plated 
water  cocks,  two  of  which  are  threaded  for  attaching  aspirators,  four  nickel-plated 
double  gas  cocks  (8  outlets),  water,  gas  and  waste  pipe  complete  to  the  floor  line. 

Finish — Top  and  reagent  bottle  shelves  are  finished  black  acid  proof  and  balance  of 
desk  one  coat  filler,  two  coats  of  varnish,  antique,  unless  otherwise  ordered. 

Weight^Crated,  1,500  pounds. 

Desks  are  made  in  sections  small  enough  to  take  through  narrow  doors. 


THE  DENVER  FIRE  CLAY  COMPANY. 


333 


SCALES,  BALANCES  AND  WEIGHTS. 

No. 

309a  1  Union  Scale  with  two  platforms,  scoop  capacity  from  y2  oz.  to  30  Ibs.  Platform 
capacity  up  to  240  Its.,  size  of  platform  lO1/^  x  13^". 

281  1  Moisture  Scale  D.  F.  C.,  beam  graduated  in  percentages  and  pounds.  Very 
accurate. 

320a    2  Scale  Covers  of  rubber  sheeting,  dust  proof,   made  to  fit  balances  selected. 

338  2  Sets  Becker's  Imported  Gramme  Weights,  50  grammes  to  1  milligramme,  and 
three  Riders. 

228  2  Thompson's  Chemical  Balances,  style  No.  31,  6-inch  beam,  sensibility  1-10  milli- 

gramme, single  riders,  steel  knife  edges  and  agate  bearings,  fall  away  pan 
rests  and  leveling  screws,  mahogany  case,  size  20  x  17  x  10. 

OR, 

229  2  Ainsworth  Analytical  Balances,  Type   Q,  7-inch  beam;    sensibility,   1-20  milli- 

gramme; capacity,  200  grammes.  Hard  rolled  nickeled  aluminum  beam, 
agate  edges  and  bearings,  double  rider,  skeleton  hangers,  two  level  vials 
in  base.  Plate  glass  covering  entire  base,  all  metal  work  gold  plated  except 
center  bearings  and  drop  levers.  Polished  mahogany  case,  dimensions, 
20x20x10;  weight,  packed,  60  Ibs. 

If  this  type  of  Balance  is  selected,  add  to  total  estimate  $60.00  each. 
OR, 

240  2  Becker  8A  Analytical  Balances;  sensibility,  1-20  milligramme;  capacity,  200 
grammes;  agate  bearings  and  edges,  5-16  plate  glass  base,  beam  graduated 
1-10  milligramme,  double  rider,  mahogany  case. 

If  this  type  is  selected,  add  to  total  estimate  $60.00  each,  the  same  as  in  the 
case  of  the  Ainsworth  Balance. 


GLASSWARE. 


414      25  Nests,  Nos.  1  to  6,  Bohemian  style,  Griffin's  Lipped  Beakers. 

8  Sets  Reagent  Bottles  of  12  each,  made  from  glass  containing  no  lead,  zinc  or 
other  metallic  flux;  with  raised  letters  ground  on  the  surface,  giving  name 
and  formula  of  reagent.  Each  set  to  consist  of — 


1 — Hydrochloric  acid  Cone. 
1 — Hydrochloric  acid  Dil. 
1 — Acetic  acid. 
1 — Sulphuric  acid  Cone. 
1 — Sulphuric  acid  Dil. 
1 — Nitric  Acid  Cone. 


1— Nitric  acid  Dil. 

1 — Ammonium  hydroxide. 

1 — Ammonium  chloride. 

1 — Ammonium  sulphide  (amber). 

1 — Potassium  hydroxide. 


All  the  above  bottles  to  be  of  8  oz.  capacity. 

2  Sets  Reagent  Bottles  of  four  each,  similar  to  specification  of  previous  item  ex- 
cept to  consist  of — 


1 — Ammonium  hydroxide. 
1 — Sulphuric  acid. 


1 — Nitric  acid. 

1 — Hydrochloric  acid. 


All  above  bottles  to  be  16  oz.  capacity. 


334  THE  DENVER  FIRE  CLAY  COMPANY. 


1  Set  of  Reagent  Bottles  of  4  oz.  capacity,  as  follows — 

1 — Hydrogen  sulphide.  1 — Calcium  hydroxide. 

1 — Potassium  ferrocyanide.  1 — Magnesium  sulphate. 

1 — Potassium  sulphocyanide.  1 — Mercuric  chloride. 

1 — Potassium  carbonate.  1 — Silver  nitrate. 

1 — Potassium  sulphate.  1 — Lead  acetate. 

1 — Potassium  iodide.  1 — Ferrous  sulphate. 

1 — Potassium  ferricyanide.  1 — Ferric  chloride. 

1 — Potassium  hydroxide.  1 — Alcohol. 

1 — Ammonium  sulphide.  1 — Ammonium  sulphocyanide. 

1 — Ammonium  chloride.  1 — Barium  hydroxide. 

1 — Ammonium  carbonate.  1 — Barium  carbonate. 

1 — Ammonium  oxalate.  1 — Ether. 

1 — Sodium  phosphate.  1 — Cupric  sulphate. 

1 — Barium  chloride.  1 — Sodium  carbonate. 

1 — Calcium  chloride.  1 — Sodium  hydroxide. 

1 — Calcium  sulphate.  3 — Blank  label  bottles. 

No. 

510      2  Doz.  1-gallon  Green  Glass  so-called  Acid  Bottles,  for  storage  of  standard  solu- 
tions. 

504       2  Doz.  Bottles,  2-oz.,  extra  wide  mouth,  flint  glass,  for  salts. 

522       10  Dropping  Bottles,  indicator  containers. 

534       1  Doz.  Wash  Bottles,  24-oz.,  complete  with  Rubber  Stoppers  and  Glass  Tubes. 

573      1%  Doz.  Burettes,  Mohr's,  with  Geissler's  Glass  Stopcock,  50  cc.  capacity  gradu- 
ated in  1-10  cc.'s. 

925       1  Doz.  Funnel  Tubes,  bent,  thistle  top. 

1001       5  Lbs.  Soft  Glass  Tubing,  5  mm.  outside  diameter. 
5  Lbs.  Soft  Glass  Tubing,  7  mm. 
2y2  Ibs.  Soft  Glass  Rods,  5  mm. 

1222       y2  Doz.  ^-Gallon  Percolators,  conical  form,  flint  glass. 

1234       1  Doz.  Volumetric  Pipettes,  most  accurately  graduated,  capacity  10  cc. 
y2  Doz.  Volumetric  Pipettes,  most  accurately  graduated,  capacity  25  cc. 

1430      2  Sulphuretted  Hydrogen  Generators,  Kipp's  form. 

1491       3  Gross  Test  Tubes,  best  German  glass,  well  annealed,  free  from  lead,  each  piece 
wrapped  in  paper  6"x%". 

1  Gross  Test  Tubes,  best  German  glass,  well  annealed,  free  from  lead,  each  piece 

wrapped  in  paper  3"x%". 

862       y2  Doz.  Filter  Flasks,  conical,  with  side  neck,  for  use  with  filter  pump,  capacity 
8  oz. 

753       1  Doz.  Graduated  Cylinders,  with  lip,  double  graduation  in  cc.'s  up  and  down, 
capacity,  50  cc.'s. 

2  Graduated  Cylinders,  with  lip,  double  graduation  in  cc.'s  up  and  down,  capacity, 

500  cc.'s. 

1  Graduated  Cylinder,  with  lip,  double  graduation  in  cc.'s  up  and  down,  capacity, 
1000  cc.'s. 

764       1  Doz.  Scheibler's  Dessicators,  with  knob  top,  ground  air  tight;  diameter,  6". 

854      3  Doz.    Copper   Determination   Flasks,   made    of   Resistance   glass,    pear-shaped, 
wide  mouth  and  broad  flange;   capacity,  8  oz. 

853       1  Doz.  Erlenmeyer  Flasks,  Resistance  glass;    capacity,  4  oz. 

1  Doz.  Erlenmeyer  Flasks,  Resistance  glass;    capacity,  6   oz. 

870       8  Only  Volumetric  "Litre  Flasks,"  most  accurately  graduated;  capacity,  1000  cc. 
8  Only  Volumetric  "Litre  Flasks,"  most  accurately  graduated;   capacity,  250  cc. 

905       2  Doz.  Bunsen  Funnels,  with  thin  and  extra  long  stems,  top  ground  even  and 
stem  ground  to  a  point.     Angle,  60°;   diam.,  2%". 

2  Doz.  Bunsen  Funnels,  with  thin  and  extra  long  stems,  top  ground  even  and 

stem  ground  to  a  point.     Angle,  60°;   diam.,  3". 


THE  DENVER  FIRE  CLAY  COMPANY.  335 


No. 
901       l/2  Doz.  Funnels;  diam.,  8",  best  German  glass. 

1501       1  Thermometer,  Chemical,  scale  engraved  on  stem,  with  white  back,  very  exact, 
in  pasteboard  case,  graduated  to  200°  C. 

1294       y2  Doz.  Potash  Bulbs,  Geissler's,  plain,  for  steel  analysis. 
1566       1  Doz.  Calcium  Chloride  Tubes,  Volhard's;   length,  5". 
1584       1  Doz.  Gooch  Filtering  Tubes  for  Gooch  crucibles. 

1601       4  Doz.  Watch  Glasses,  well  annealed,  with  ground  edges;  diameter,  2%" 

4  Doz.  Watch  Glasses,  well  annealed,  with  ground  edges;  diameter,  3". 

4  Doz.  Watch  Glasses,  well  annealed,  with  ground  edges;  diameter,  4". 

4  Doz.  Watch  Glasses,  well  annealed,  with  ground  edges;  diameter,  5". 

319       2  Sets,  4  Each,  Scale  Feet,  for  holding  leveling  screws  of  balances,  giving  per- 
fect insulation. 

PORCELAIN   WARE. 

635a     1  Doz.  Casseroles,  German  porcelain;  capacity,  4  oz. 
1  Doz.  Casseroles,  German  porcelain;  capacity,  8  oz. 

661       1  Doz.  Color  Test  Plates,  with  12  cavities;  size,  3^4x4%". 

716      3  Doz.  Crucibles,  Royal  Berlin  porcelain,  with  covers,  glazed  inside  and  outside. 

No.  00;  size,  1%";   capacity,  y2  oz. 

1  Doz.  Crucibles,  Royal  Berlin  porcelain,  with  covers,  glazed  inside  and  outside, 
No.  2;  size,  2";   capacity,  1%  oz. 

787       1  Doz.   Evaporating  Dishes,   German   porcelain,   glazed   inside   with    heavy   rim, 
No.  9;   capacity,  12  oz. 

723      1  Doz.  Gooch  Crucibles,  Royal   Meissen  porcelain,  with  perforated  bottom,  and 
cover. 

PLATINUM    WARE. 

3  Ft.  No.  27  Platinum  Wire. 

1257       4  Platinum   Crucibles,   with   Covers,   best   hammered   ware;    capacity,    15    cc.'s; 
weight,  15  grammes  each. 

1259       1  Platinum   Cylinder 'and    Spiral    for   quantitative    determination   of   copper   by 
electrolysis;   cylinder,  2"xl";   total  weight,  about  20  grammes. 

MATERIAL    OF    IRON. 

434  1  Bunsen's  Blast  Lamp  for  gas,  improved  form. 

603  1  Doz.  Bunsen  Burners,  usual  size,  with  air  regulation. 

624  1  Fletcher's  Radial  Burner  for  hood  purposes. 

848  1  Hichards  Filter  Pump. 

1056b  1  Electric  Hot  Plate,  three  heats,  from  100°  to  600°  F.;   size,  12"  x  24". 

1286  1  Pair  Pliers,  side  cutting,  steel;   length,  5". 

1361  1  Doz.  Sand  Baths,  sheet  iron,  shallow;  diameter,  4". 

1372       1  Nest  Sieves,  10,  20,  30,  40,  60,  80,  100,  120,  150,  200  mesh,  ten  in  each  nest, 
diameter,  8". 

1387       1  Doz.  Spatulas,  steel,  with  cocoa  wood  handle;   length  of  blade,  4". 

1452      8  Rectangular  Base  Ring  Stands  for  flasks,  retorts,  etc.,  complete  with  2",  3" 
and  4"  rings. 

651      8  Burette  Clamps  of  iron,  with  set  screws  to  attach  to  retort  stand. 
816       1  Doz.  Triangular  Files;   length,  4". 


336  THE  DENVER  FIRE  CLAY  COMPANY. 


No. 

1552       1%  Doz.  Iron  Tripods  for  Bunsen  burners. 

1525      1  Doz.  Crucible  Tongs,  rod  iron,  double  bent,  japanned;  length,  9". 

MATERIAL  OF  WOOD. 

1446       1  Doz.  Burette  Supports,  hardwood  clamp,  lined  with  cork,  holding  two  burettes 

each. 

1457      1  Doz.  Funnel  Supports,  one  double  arm  for  four  funnels. 
1464       8  Test  Tube  Racks,  for  13  tubes,  in  two  shelves,  with  7  pins  and  %"  holes. 

RUBBER    MATERIAL. 

441      1  Fletcher's  Blower,  foot  bellows,  gives  continuous  blast  of  air;   No.  9;   diam- 
eter, 7%". 

1338       18  Sq.  ft.  Black  Rubber  Sheeting,  vulcanized  on  muslin. 

1336      5  Lbs.  Rubber  Stoppers,  assorted  sizes,  solid,  1  hole  and  2  holes. 

3342      48  Ft.  3-16"  Pure  Gum  Rubber  Tubing. 
48  Ft.  !/£"  Pure  Gum  Rubber  Tubing. 

1345a    48  Ft.  %"  Rubber  Tubing,  white,  light  wall,  hand  made,  for  gas  connections. 
1344       2  Ft.  Gooch  Rubber  Tubing,  band,  pure  gum,  light  walls,  for  Gooch  crucibles. 

MISCELLANEOUS. 

557  1  Doz.  Brushes,  bristle,  for  test  tubes,  with  sponge  ends  for  protection  to  test 

tube  ends. 

558  4  Brushes,  bristle,  for  burettes;   length,  3  ft. 

553      1  Doz.  Camel  Hair  Brushes,  extra  large  stock,  quill  holder,  %". 

1102       iy2  Doz.  boxes  Gummed  Labels,  colored  rims,  No.  261. 
iy2  Doz.  boxes  Gummed  Labels,  colored  rims,  No.  201. 

1151      1  Agate  Mortar,  with  Pestle,  best  quality  agate,  size  3%". 

1398       1  Ralston  New  Process  Still,  of  copper-plated  pure  block  tin,  with  Pura  Germ 
Proof  Aerating  Cap;  diameter,  9";  height,  14%". 

642  1  Doz.  Test  Tube  Clamps  of  spring  wire,  for  all  sizes  test  tubes. 

644  1  Doz.  Chaddock  Beaker  Clamps  of  japanned  spring  wire,  rubber  covered  jaws. 

646  2  Doz.  Pinchcocks,  nickel  plated,  strong  spring. 

648  1%  Doz.  Clamps  for  rubber  tubing;  width,  1%". 

681  3  Gross  Assorted  Corks. 

725  8  Nickel  Crucibles  of  pure  nickel  for  Alkaline  fusions. 

809      1  Drying  Oven,  single  wall,  of  copper,  with  opening  for  thermometer,  movable 
shelf  and  extra  sheet  iron  bottom. 

821       5  Pkgs.  Prat-Dumas  Filter  Paper,  diameter  8". 

827       2  Doz.  pkgs.  S.  &  S.   "White  Ribbon"  Filter  Paper,  washed  with  Hydrochloric 

and  Hydrofluoric  acids,  quick  filtering  and  retaining  BaSO4;  diameter,  9  cm. 

2  Doz.  pkgs.  S.  &  S.  "White  Ribbon"  Filter  Paper,  washed  with   Hydrochloric 

and  Hydrofluoric  acids,  quick  filtering  and  retaining  BaSO4;  diameter,  7  cm. 

1546      1  Doz.  Pipe  Stem  Triangles,  improved  form,  small. 

1  Doz.  Pipe  Stem  Triangles,  improved  form,  medium. 

1  Doz.  Wire  Gauze,  with  asbestos  center,  6"  square. 

1  Hendryx  14"  Combination  Agitator  and  Filter  for  cyanidation  tests;   capacity, 

20  Ibs.  ore,  40  Ibs.  solution;  shipping  weight,  100  Ibs. 

We  have  only  intended  to  itemize  here  all  the  articles  that  would  be  included  in 
a  fairly  complete  laboratory  equipment,  to  be  used  as  a  memorandum.  It  will  not  fill 
all  requirements,  but  we  offer  it  as  a  suggestion  to  assist  in  compiling  a  list.  The  price 
will  naturally  vary  to  conform  to  different  specifications. 

Please  select  your  list,  giving  catalogue  numbers,  and  let  us  quote  you  a  net  price. 


THE  DENVER  FIRE  CLAY  COMPANY. 


337 


SET    OF    BLOW    PIPE    APPARATUS,    AS    DESCRIBED    IN 
MANUAL    OF   ASSAYING." 


'BROWN'S 


No.  4000— 


1  1 

2  1 

3  1 

4  1 

5  1 

6  1 

7  1 

8  1 

9  1 

10  1 

11  1 


12 
13 


15 
16 


14     1 


Set  (3)  Porcelain  Dishes.  17 

Diamond  Steel  Mortar.  18 

Pair  Platinum  Pointed  Forceps.  19 

Pair  Heavy  Tip  Steel  Forceps.  20 

Pair  Steel  Forceps.  21 

Steel  Chisel.  22 
Charcoal  Borer,  Club  Shape. 

Charcoal  Borer,  with  Spatula.  24 

Pair  Scissors.  25 

Platinum  Holder,  with  6  Wires.  26 

Plattner's  Blow  Pipe  Lamp  with  27 

Swivel.  28 

Charcoal  Saw.  29 

Matrass  Holder.  30 
Plattner's  Blow  Pipe,  nickel-plated. 
Platinum  Tip  for  same. 
Steel  Hammer  with  Wire  Handle. 

Test  Lead. 
Tin. 

Phosphorus  Salt. 
Borax  Powder. 
Borax  Glass. 
Boracic  Acid,  fused. 
Boracic  Acid,  cryst. 
Plattner's  Flux. 
Bismuth  Flux. 


1  Set  Moulds  and  Stamps. 

1  Pair  Nippers. 

1  Double  Lens. 

1  Knife. 

1  Dropping  Pipette. 

1  Camel  Hair  Brush. 

6  Matrasses. 

1  Glass  Alcohol  Lamp. 

1  Chamois  Skin. 
6  Glass  Tubes. 

J  Doz.  Charcoals. 
Coal  and  Ash  Trays. 

2  Books  Test  Papers. 

Frame,  with  18  Glass-Stoppered  and 
Labeled  Reagent  Bottles,  contain- 
ing the  following  reagents: 


Carbonate  Soda. 

Potash  Oxalate. 

Salt. 

Soda  Nitrate. 

Charcoal. 

Bone  Ash,  sieved. 

Bone  Ash,  washed. 

Copper  Oxide. 

Bisulphate  Potash. 


Price  for  complete  set,  securely  packed  in  neat  wooden  carrying  case,  including 

"Quantitative  Assaying  with  the  Blowpipe,"  by  E.  L.  Fletcher Net  $30.00 


No.  4010— 


PROSPECTORS'  BLOW  PIPE  OUTFIT  NO.  1. 


1  Jewelers'  Blow  Pipe,  nickel-plated. 

1  Alcohol  Lamp. 

1  Magnifying  Lens,  double. 

1  Porcelain  Mortar,  2^4  in. 

2  Porcelain  Crucibles. 

2  Porcelain  Crucible  Covers. 
•1  Funnel,  Glass,  2-in. 

1  Doz.  Test  Tubes,  3-in. 

1  Doz.  Glass  Tubes  and  Rods,  assorted. 

3  Small  Beakers,  0  to  000. 
1  Pair  Slag  Forceps. 

1  Spatula,  3-in. 

1  Piece  Sheet  Zinc. 

1  Piece  Copper  Wire. 

1  Piece  Tin  Foil. 

1  Chamois  Skin. 

1  H.  S.  Magnet,  3-in. 


1  Piece  Iron  Wire. 

Platinum  Wire  and  Holder. 

3  Carbon  Sticks. 

1  Pkg.  Filter  Paper. 

2  Drs.  Ferrous  Sulphate. 
2  Drs.  Borax  Glass. 

2  Drs.  Oxalic  Acid. 

2  Drs.  Sodium  Carbonate,  dry. 

1  Oz.  Sulphuric  Acid,  c.p.  conct. 

1  Oz.  Muriatic  Acid,  c.p.  conct. 
|  Lb.  Nitric  Acid,  c.p.,  conct. 

\  Lb.  Ammonia,  strong. 

4  Ozs.  Alcohol. 

2  Ozs.  Mercury. 

2  Ozs.  Granulated  Lead. 
2  Drs.  Carbonate  Potash. 
|  Doz.  Charcoals. 


Packed  in  fine  wooden  carrying  case  with  metal  handle $10.00 

"Cornwall's  Blow  Pipe  Analysis,"  extra 2.50 

The  above  is  a  cheap,  condensed  list  of  Apparatus  and  Chemicals  for  practical  work. 

"Cornwall's  Blow  Pipe  Analysis"  will  be  found  a  satisfactory  guide  in  making  blow 
pipe  tests. 


338 


THE  DENVER  FIRE  CLAY  COMPANY, 


PROSPECTORS'  BLOW  PIPE   OUTFIT  NO.  2. 


No.  4020— 


1  Dr.  Potash  Bisulphate,  c.p. 
1  Dr.  Copper  Oxide,  c.p. 
1  Dr.  Copper  Sulphate. 
1  Dr.  Calcium  Carbonate. 
1  Dr.  Oxalic  Acid. 
1  Dr.  Silver  Nitrate. 
1  Piece  Silver  Foil,  c.p. 
1  Piece  Tin  Foil,  c.p. 
1  Piece  Copper  Foil,  c.p. 
1  Piece  Copper  Wire. 
1  Piece  Zinc  Sheet. 
1  Piece  Magnesium  Ribbon. 

1  Spool  Iron  Wire,  pure. 

2  Books  Litmus  Paper. 

1  Sheet  Turmeric  Paper. 

2  Ozs.  Muriatic  Acid,  c.p.,  conct. 
|  Lb.  Nitric  Acid,  c.p.,  conct. 

2  Ozs.  Sulphuric  Acid,  c.p.,  conct. 

2  Ozs.  Ammonia,  conct. 

2  Ozs.  Mercury. 

\  Lb.  Bone  Ash. 

I  Pt.  Alcohol. 

|  Doz.  Charcoals. 


1  Plattner's  Blow  Pipe  and  Platinum  Tip. 

1  Alcohol  Lamp. 

1  Oil  Lamp  (Berzelius). 

1  Pair  Platinum  Pointed  Forceps. 

1  Pocket  Magnifying  Lens,  double. 

1  Agate  Mortar,  IJ-in. 

2  Porcelain  Dishes. 

2  Glass  Funnels. 

1  Doz.  Test  Tubes. 

1  Doz.  Glass  Tubes  and  Rods. 

3  Small  Beakers. 
1  Bone  Spoon. 

1  Pair  Forceps. 
1  Magnet,  3-in. 
1  Hammer. 

1  Anvil. 

Platinum  Wire  and  Holder. 

2  Drs.  Sodium  Carbonate,  dry,  c.  p. 
2  Drs.  Borax  Glass. 

2  Drs.  Microcosmic  Salt,  c.p. 

2  Drs.  Lead,  Finely  Powdered,  c.p. 

2  Drs.  Lead  Flux. 


Apparatus  and  chemicals  for  field  work,  securely  packed  in  convenient  portable 

case  of  hard  wood $20.00 


COMPLETE    ASSAY   OUTFIT    FOR    MINE. 


No.  4030— 


1  Gold  Button  Balance. 
1  Silver  Button  Balance. 
1  Analytical  Balance. 
1  Bullion  Balance. 
1  Pulp  Balance. 
1  Set  Weights,  60  Kgs.  down. 
1  Set  Weights,  1  grm.  to  1-10  n:g. 
1  Set  Weights,  50  grm.  to  1  mg. 
1  Set  Weights,  1  A.  T.  to  1-20. 
16  Glass  Scale  Feet. 
4  Rubber  Balance  Covers. 
1  Moisture  Scale,  1  kg. 
1  Union  Flux  Scale. 
1  Doz.  D.  F.  C.  annealing  Cups. 
1  Annealing  Cup  Tray. 
1  Slag  Anvil  6x6". 
1  Sheet  Asbestos  Board  40x40x1/4". 

1  Doz.  Griffin  Beakers  No.  1. 

2  Doz.  Griffin  Beakers  No.  2. 
1  Doz.  Griffin  Beakers  No.  3. 

1  Jewelers'  Blowpipe  No.  467. 
6  Bottles  G.  S.  500  cc.  No.  509. 
6  Bottles  G.  S.  500  cc.  No.  512. 

2  Dropping  Bottles,  Schuster's,  1  oz. 


3  Wash  Bottles  1000  cc. 
6  Reagent  Bottles,  8  oz. 
6  C.  H.  Pencils,  med. 

1  C.  H.  Brush  W,  round  quill. 
1  C.  H.  Brush  1",  H.  R.  B. 

1  Test  Tube  Brush  %". 

2  Buckboard  Brushes,  4"  No.  566a. 

1  Buckboard  Brush  No.  568. 

2  Button  Brushes. 

4  Burettes,  50  cc.  1-10,  G.  S. 
4  Burette  Caps. 

2  Burette  Floats. 

1  Blast  Lamp  No.  614. 
6  Casseroles  R.  B.  No.  2. 
6  Casseroles  R.  B.  No.  3. 
6  Watch  Glasses,  3". 
6  Watch  Glasses,  3V2". 
1  Button  Tray  No.  634. 

1  Test  Tube  Clamp  No.  641. 

3  Mohr's  Pinchcocks,  med. 

2  Hofmann  Clamps,  med.  No.  648. 

3  Doz.  Taper  Corks,  med.,  assorted. 
2  Doz.  R.  B.  Crucibles  No.  00. 

6  Spun  Iron  Crucibles,  1  oz. 


THE  DENVER  FIRE  CLAY  COMPANY. 


339 


1  Case  Crusher,  large  size,  power. 

1  Her  Disc  Sample  Grinder. 

2  Buckboards  20x24". 

2  Mullers  and  Handles. 

1  Her  Cupel  Machine  1%"  and  1%". 

1  Brass  Cupel  Mould  1*4". 

1  Cupel  Tray  No.  749. 

1  Cupel  Shovel. 

1  Cupel  Rake. 

1  Scheibler  Desiccator  6"  and  Plate. 

1  Graduated  Cylinder  25  cc. 

1  Graduated  Cylinder  100  cc. 

1  Graduated  Cylinder  250  cc. 

1  Set  Steel  Letters  %". 

1  Set  Steel  Figures  %". 

i  Doz.  R.  B.  Evaporating  Dishes,  No.  1. 

1  Only  R.  B.  Evaporating  Dish  No.  6. 

1  Only  R.  B.  Evaporating  Dish  No.  9. 

2  Triangular  Files,  5". 
1  Round  File,  6". 

1  Drying  Oven  8x10  No.  810  and  Support. 
500  Filter  Papers  No.  597,  11  cm. 
500  Filter  Papers  No.  3,  18  cm. 
100  Filter  Papers,  B.  and  A.,  double 
washed,  9  cm. 

1  Doz.  Erlenmeyer  Flasks,  6  oz. 

1  Doz.  Copper  Flasks,  8  oz. 

2  R.  N.  Flasks,  1  liter. 

1  Doz.  Parting  Flasks,  1  oz. 

1  Volumetric  Flask,  1.000  cc.  No.  870. 

1  Volumetric  Flask  500  cc.  No.  870. 

1  Pair  Forceps  No.  884. 

1  Pair  Forceps  No.  885. 

1  Pair  Forceps  No.  886. 

2  Pairs  Forceps  No.  890,  6". 

1  Doz.  Bunsen  Funnels,  2%". 

4  Doz.  German  Funnels,  4". 

1  Case  Furnace  No.  14. 

i  Kg.  Glass  Tubing  and  Rods. 

1  Pr.  Asbestos  Mittens. 

1  Steel  Gold  Pan. 

1  Slag  Hammer,  1  3-16  Ibs.  No.  1046. 

1  Slag  Hammer.  8  oz.,  No.  1046 

1  Electric  Hot  Plate  12"xl8". 

1  Gasoline  Stove,  2  burners. 

1  Hydrometer  for  heavy  liquids. 

1  Hydrometer  for  light  liquids. 
3  Boxes  Gummed  Labels. 

2  Alcohol  Lamps,  brass,  8  oz. 
1  Dangler  Lamp. 

1  Lead  Measure. 

1  Cupel  Mallet,  rawhide. 

1  Magnifier,  double  lens. 

1  Agate  Mortar,  3"  and  Pestle. 

1  Leed's  Mortar. 

1  Wedge  wood  Mortar  and  Pestle  No.  3. 

1  Pouring  Mould,  12  hole,  No.  1177. 

1  Pouring  Mould,  heavy,  6  hole,  No 


4  D.  F.  C.  Muffles,  10x16. 
1000  Weaver  Mailing  Envelopes,  2  oz. 
1000  Union  Ore  Bags,  No.  1215. 

3  Percolators,  Vz  gal. 

2  Pipettes,  Vol.  10  cc. 


1  Pipette,  Vol.  25  cc. 

1  Pipette,  Vol.  50  cc. 

1  Pair  Button  Pliers,  No.  1282. 

1  Pair  Cutting  Pliers. 

1  "Cover"  Respirator. 

6  Roasting  Dishes,  6". 

1  Metal  Rolls  No.  2,  No.  1322. 

\  Lb.  Rubber  Stoppers,  assorted. 

2  Yds.  Rubber  Sheeting,  black. 

12  Ft.  Pure  Gum  Tubing,  3-16",  med. 
6  Ft.  Pure  Gum  Tubing,  %",  med. 
2  Ft.  Pure  Gum  Tubing,  y2",  med. 

1  Sampler  and  Scoop,  12"  x  12". 

2  Doz.  Tin  Sample  Pans,  6"  dia. 

\  Doz.  Sheet  Iron  Sample  Pans,  6"x9". 

2  Horn  Scoops,  No.  1358. 

3  Sand  Baths,  6". 

1  Bbl.  Crucibles,  15  gr. 
1000  Scorifiers,  D.  F.  C.,  2%". 
1  Pr.  Hand  Shears,  9"  blade. 
1  Pr.  Tinner's  Snips,  2%"  blade. 

1  Nest  D.  F.  C.  Sieves,  8"  dia.;  Nos.  20- 

30-40-50-60-80-100-120-150-200. 

2  Spatulas,  4",  No.  1387. 
1  Spatula,     6",  No.  1387. 
1  Spatula,     8",  No.  1387. 
1  Ralston  Still. 

1  Kipp  H,S  Generator,  1000  cc. 

2  Chaddock's  Burette  Supports. 

1  Funnel  Support  for  15  funnels,  wooden, 

No.  1440. 
1  Funnel  Support,  Wooden,  No.  1457. 

1  Test  Tube  Support  for  12,  No.  1462. 

2  Doz.  Test  Tubes  5"x%". 

1  Chemical  Thermometer,  250°  C.,  No. 

1501. 

1  Pr.  Crucible  Tongs,  nickel-plated,  9". 
1  Pr.  Crucible  Tongs,  steel,  9". 
1  Pr.  Scorifier  Tongs,  36"  for  2%"  size. 
1  Pr.  Scorifier  Tongs,  36"  for  3"  size. 
1  Pr.  Cupel  Tongs,  36",  No.  1530. 
6  Pipe  Stem  Triangles. 
1  Iron  Support,  3  rings,  No.  1452. 
1  Tripod,  3  rings,  No.  1553. 

3  Glass  T  Tubes,  %". 
3  Glass  Y  Tubes,  1,4". 

1  Copper  Water  Bath,  6",  No.  1611. 

1  Doz.  Watch  Glasses,  3^". 

2  Doz.  Watch  Glasses,  4". 

1  Doz.  Watch  Glasses,  4 Ms". 
1  Color  Plate,  12  cavities. 

1  Set  Cork  Borers,  Nos.  1  to  6. 

2  Pencils  for  Glass. 

3  Precipitating  Jars,  1  qt. 
1  Lb.  Sealing  Wax. 

50  Duck  Ore  Bags,  6"xlO". 
50  Lbs.  Granulated  Lead  c.  p. 
100  Lbs.  Litharge,  c.  p.  Pueblo  brand. 

1  Keg  Soda  Bicarbonate. 
50  Lbs.  Potash  Carbonate. 
50  Lbs.  Borax  Glass. 
10  Lbs.  Argols. 
200  Lbs.  Bone  Ash. 

5  Lbs.  Lead  Foil,  c.  p. 

1  Oz.  Silver  Foil,  c.  p. 


340 


THE  DENVER  FIRE  CLAY  COMPANY. 


8  Lbs.  Ammonia,  c.  p.  1  Oz. 
21  Lbs.  Nitric  Acid,  c.  p.  £  Lb. 
12  Lbs.  Hydrochloric  Acid,  c.  p.  i  Lb. 

9  Lbs.  Sulphuric  Acid,  c.  p.  J  Lb. 
1  Lb.  Acetic  Acid,  c.  p.,  99^%.  J  Lb. 
1  Oz.  Copper  Foil,  c.  p.  £  Lb. 

1  Oz.  Iron  Wire,  c.  p.  k  Lb. 

2  Books  Litmus  Paper.  2  Lbs 
J  Lb.  Oxalic  Acid,  c.  p.  J  Lb. 
1  Gal.  Alcohol,  96%.  I  Lb. 
1  Lb.  Tartaric  Acid,  c.  p.  J  Lb. 
|  Lb.  Tannic  Acid,  c.  p.  J  Lb. 
|  Lb.  Aluminum  Sheet,  c.  p.  J  Lb. 
1  Lb.  Ammon.  Acetate,  c.  p.  10  Lbs 
J  Lb.  Ammon.  Carbonate,  c.  p.  1  Oz. 
1  Lb.  Ammon.  Chloride,  c.  p.  |  Lb. 
1  Oz.  Ammon.  Molybdate,  c.  p.  J  Lb. 
\  Lb.  Ammon.  Oxalate,  c.  p.  i  Lb. 
|  Lb.  Ammon.  Sulphate,  c.  p.  \  Lb. 
1  Lb.  Barium  Chloride,  c.  p.  I  Lb. 

1  Lb.  Calcium  Chloride  gran,  for  desic-  £  Lb. 

cator.  1  Oz. 

4  Lb.  Copper  Sulphate,  c.  p.  5  Lbs 

2  Lbs.  Iron  Sulphide.  \  Lb. 
1  Lb.  Lead  Acetate,  c.  p.  J  Lb. 

10  Lbs.  Lead  Acetate,  com'l. 

We  have  only  intended  to  itemize  here  all  the  articles  that  go  to  make  up  a  fairly 

complete  assay  equipment,  to  be  used  by  the  prospective  purchaser  as  a  memorandum. 
It  may  not  fit  the  requirements,  but  will  act  in  a  suggestive  way  in  compiling  a  list.  The 
price  will  naturally  vary  to  conform  to  the  different  specifications,  as  it  is  impossible  for 

us  to  suggest  a  list  to  suit  all  occasions.  Please  select  your  list,  giving  catalogue  num- 
bers, and  let  us  quote  you  a  net  price. 


Lead  Sulphate,  c.  p. 
Manganese  Sulphate,  c.  p. 
Mercury  Bichloride,  c.  p. 
Potass.  Bichromate,  c.  p. 
Potass.  Carbonate,  c.  p. 
Potass.  Caustic,  c.  p.  by  ale. 
Potass.  Chlorate,  c.  p. 
,  Potass.  Cyanide,  Merck,  pure. 
Potass.  Ferricyanide,  c.  p. 
Potass.  Ferrocyanide,  c.  p. 
Potass.  Iodide,  c.  p. 
Potass.  Permanganate,  c.  p. 
Reddle. 

.  Silica  Powder. 
Silver  Nitrate,  c.  p. 
Sodium  Carbonate  anhyd,  c.  p. 
Sodium  Caustic,  c.  p.  by  ale. 
Sodium  Hyposulphite,  c.  p. 
Sodium  Phosphate,  c.  p. 
Tin  Granulated,  c.  p. 
Stannous  Chloride,  c.  p. 
Uranium  Acetate,  c.  p. 
.  Zinc  Shavings. 
Zinc  Granulated,  c.  p. 
Zinc  Oxide,  c.  p. 


ASSAY  OUTFIT  FOR  PROSPECTORS. 


No.  4040— 

1  Portable  Button  Balance  and  Weights. 
1  Pulp  Balance  and  Weights. 
1  Furnace  ("Burro"  or  Brown), 
or, 

1  Case  Gasoline  Furnace  with  Blow  Pipe 

Tank. 

2  Muffles. 
200  Scorifiers. 

50  Crucibles. 

1  Quart  Mortar  and  Pestle  (iron). 

2  Pairs  Tongs. 

1  Magnifying  Lens. 
1  Lead  Mould. 


Cupel  Mould. 
Magnet. 


3  Pairs  Pliers. 
1  Spatula. 

Glass  Rod  and   Tubes. 
1  Glass  Alcohol  Lamp. 
1  Sieve,  60-Mesh. 
3  Beakers  and  Covers. 


1  Blow  Pipe,  Plattner's. 

3  Funnels. 

1  Pkg.  Filter  Paper. 
1  Button  Brush. 
1  Wash  Bottle. 
6  Parting  Flasks. 

1  Tripod. 

6  Annealing  Cups. 

2  Hammers. 

4  Lbs.  Litharge. 

5  Lbs.  Soda' Bicarb. 
1  Lb.  Argols. 

1  Lb.  Muriatic  Acid,  c.  p. 

1  Lb.  Nitric  Acid,  c.  p. 
10  Lbs.  Bone  Ash. 

2  Lbs.  Borax  Glass. 

|  Oz.  Silver  Foil,  c.  p. 
J  Lb.  Rolled  Lead,  c.  p. 
10  Lbs.  Granulated  Lead,  c.  p. 

1  Pt.  Alcohol. 

2  Lbs.  Lead  Flux. 


The  button  balance  and  weights  given  with  this  outfit  are  Cat.  No.  226,  the  Pulp 
Balance  is  Cat.  No.  271;  the  Furnace  is  either  the  Burro  or  Brown  Furnace,  Cat.  No.  935 
or  938,  and  left  optional  with  purchaser.  Should  different  balances  or  furnaces  be  wanted, 
or  the  outfit  in  any  way  changed,  please  submit  us  revised  list  for  quotation.  The  above 
outfit  weighs,  packed  for  shipment,  300  Ibs.  with  Burro  furnace,  or  350  Ibs.  with  Brown. 

Price  complete,  packed  for  shipment,  f.  o.  b.  Denver $125.00 

Or  with  one  Button  Balance  and  Weights,  Catalogue  No.  223a,  f.  o.  b.  Denver 140.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


341 


MEMORANDA     OF    OUTFIT     FOR    COPPER    ASSAYS     BY    CYANIDE     POTASSIUM 

METHOD. 


No.  4050— 

1  Pulp  Balance. 

1  Set  Gramme  Weights,  50-Gramme  to  1 

Milligramme. 

2  Pairs  Forceps. 
2  Spatulas. 

1  yz-Gal.  Iron  Mortar. 

1  80-Mesh  Sieve. 

1  Doz.  Copper  Flasks. 

|  Doz.  3%  in.  Funnels,  Bunsen's. 

i  Doz.  Sand  Baths. 

1  10  cc.  Cylinder. 

4  10  cc.  Pipettes. 
1  8-Oz.  Graduate. 

J  Doz.  8-Oz.  Beakers. 
9  Lbs.  Sulphuric  Acid,  com'l. 
8  Lbs.  Ammonia  Water,  strong. 
1  Lb.  Cyanide  Potash,  Pure. 
6  Sheets  Copper  Foil,  c.  p. 
i  Gal.  Alcohol. 

5  Pts.  Distilled  Water. 

i  Doz.  Pkgs.  Gray  Filter  Paper,  7-in. 

%  Doz.  Pkgs.  S.  &  S.  Filter  Paper,  185  c.  m. 

1  Lb.  Granulated  Zinc,  pure. 

i  Doz.  12-Oz.  Beakers. 


1  Dangler  Blast  Lamp,  gasoline. 
1  8-Oz.  Alcohol  Lamp,  glass. 

1  Lb.  Glass  Rods  and  Tubing. 

2  Burettes,    Glass    Stopcock,    graduated 

in  l-10th. 
1  Burette  Float. 

1  3-Ring  Stand. 

2  Funnel  Stands,  for  4  funnels. 
1  Sampler  and  Scoop. 

1  Buckboard  and  Muller. 

6  Lbs.  Muriatic  Acid,  com'l. 

7  Lbs.  Nitric  Acid,  com'l. 
7  Lbs.  Nitric  Acid,  c.  p. 

5  Lbs.  Sheet  Zinc,  cut  in  strips,  com'l. 
1  Color  Plate,  Porcelain. 

1  H..S  Apparatus,  small. 

2  Empty  Bottles. 

6  Ft.  Rubber  Tube. 

3  Pinchcocks. 

1  Box  Labels,  Blank. 

1  Book  Labels,  chemical. 

2  Books  Litmus  Paper. 

J  Doz.  Casseroles,  No.  3. 


Battery  outfits  for  copper  analysis  can  be  furnished  as  desired. 


MULE  BACK  TRANSPORTATION 


When  goods  have  to  be  trans- 
ported on  mule  back,  we  will  pack 
in  cases  of  suitable  size  without 
extra  charge. 


342 


THE  DENVER  FIRE  CLAY  COMPANY. 


Chemical  Apparatus  and  Chemicals  in  Sets 


These  Sets  are  compiled  with  great  care,  to  include  the  most  desirable  apparatus, 
as  taught  in  all  the  modern  school  books,  avoiding  duplications  of  experiments,  and 
making  each  as  perfect  as  possible  for  the  cost  of  the  set. 


No.  4100— 


CHEMICAL  SET  NO.  1.     PRICE  $18.00. 


2  Ozs.  Acid  Acetic. 

1  Lb.  Acid  Hydrochloric. 

1  Lb.  Acid  Nitric. 

2  Lbs.  Acid  Sulphuric. 

1  Oz.  Acid  Oxalic. 

J  Oz.  Acid  Tartaric. 

2  Ozs.  Ammonium  Chloride. 
4  Ozs.  Ammonium  Hydrate. 
1  Oz.  Ammonium  Nitrate. 

1  Oz.  Ammonium  Sulphide. 

1  Oz.  Animal  Charccfal. 

I  Oz.  Antimony. 

|  Oz.  Arsenic  Trioxide. 

1  Oz.  Alum. 

8  Ozs.  Alcohol  Methyl. 

1  Oz.  Barium  Chloride. 

1  Oz.  Barium  Nitrate. 

2  Ozs.  Calcium  Carbonate. 
2  Ozs.  Calcium  Fluoride. 

4  Ozs.  Calcium  Sulphate. 

1  Oz.  Carbon  Bisulphide. 

1  Oz.  Charcoal. 

2  Ozs.  Copper  Sulphate. 
2  Ozs.  Ether. 

1  Oz.  Ferrous  Sulphide. 

2  Ozs.  Ferrous  Sulphate. 

|  Oz.  Gall  Nuts,  powdered. 


Beakers  (nest  of  3). 
Blow  Pipe. 

Flasks,  8-ozs.,  Florence. 
Hessian  Crucibles  (nest  of  4). 
Deflagration  Spoon. 
Evaporating  Dish,  2  ozs. 
Evolution  Flask  (fitted  for  making  Hydro- 
gen, Carbonic  Acid  Gas,  etc.). 
Filtering  Paper,  4-in.  dia. 
File,  4  in. 

Glass  Funnel,  2  ozs. 
Graduate,  50  cc. 


1  Oz.  Gun  Cotton. 

1  Dr.  Iodine. 

2  Ozs.  Galena. 

1  Oz.  Lead  Acetate. 

1  Oz.  Lead  Carbonate. 

2  Drs.  Litmus. 

2  Ozs.  Mercury. 

6  Ins.  Magnesium  Ribbon. 

2  Ozs.  Magnesium  Sulphate. 

1  Lb.  Manganese  Dioxide. 

1  Ft.  Platinum  Wire. 

2  Drs.  Phosphorus. 

1  Dr.  Potassium  (metallic). 

1  Oz.  Potassium  Bichromate. 

2  Ozs.  Potassium  Chlorate. 

2  Ozs.  Potassium  Ferrocyanide. 

1  Oz.  Potassium  Hydrate. 

1  Oz.  Potassium  Nitrate. 

1  Oz.  Strontium  Chloride. 

1  Oz.  Strontium  Nitrate. 

4  Ozs.  Sulphur. 

1  Dr.  Silver  Nitrate. 

1  Dr.  Sodium  (metallic). 

1  Oz.  Sodium  Biborate. 

1  Oz.  Sodium  Carbonate. 

1  Oz.  Sodium  Sulphate. 

4  Ozs.  Zinc  for  making  Hydrogen. 


Chemical  Glass  Tubing,  J  lb.,  \  in. 

Lead  Dish. 

Pipette. 

Rubber  Tubing. 

Sand  Bath. 

Spirit  Lamp,  4  ozs. 

Specie  Jar  for  Deflagration,  qt. 

Test  Tubes. 

Test  Tube  Holder. 

Test  Tube  Brush. 

Wedgewood  Mortar,  2%  in. 

Glass  Retort,  4  ozs. 


THE  DENVER  FIRE  CLAY  COMPANY. 


343 


No.  4110— 


CHEMICAL  SET  NO.  2.     PRICE  $30.00. 


J  Lb.  Acid  Acetic. 

1  Lb.  Acid  Hydrochloric. 

1  Lb.  Acid  Nitric. 

1  Oz.  Acid  Oxalic. 

2  Lbs.  Acid  Sulphuric. 
1  Oz.  Acid  Tartaric. 

1  Oz.  Ammonium  Carbonate. 

2  Ozs.  Ammonium  Chloride. 
\  Lb.  Ammonium  Hydrate. 
1  Oz.  Ammonium  Nitrate. 

1  Oz.  Ammonium  Sulphide. 

1  Pt.  Alcohol  Methyl. 

2  Ozs.  Alum. 

2  Ozs.  Animal  Charcoal. 

J  Oz.  Antimony. 

1  Oz.  Arsenious   Anhydride. 

1  Oz.  Barium  Chloride. 

1  Oz.  Barium  Nitrate. 

1  Oz.  Borax. 

\  Lb.  Calcium  Carbonate. 

2  Ozs.  Calcium  Chloride. 
2  Ozs.  Calcium  Fluoride. 
\  Lb.  Calcium  Sulphate. 
1  Oz.  Carbon  Bisulphide. 

1  Oz.  Cobalt  Nitrate. 

4  Ozs.  Copper  Sulphate. 

2  Ozs.  Ether. 

2  Ozs.  Ferrous  Sulphate. 

1  Oz.  Ferrous  Sulphide. 

2  Drs.  Gall  Nuts. 

1  Dr.  Gun  Cotton. 

1  Dr.  Iodine. 

2  Ozs.  Galena. 

1  Oz.  Lead  Acetate. 

2  Ozs.  Lead  Carbonate. 


2  Ozs.  Lead  Monoxide. 

2  Drs.  Litmus  (best  cubes). 

12  Ins.  Magnesium  Ribbon. 

2  Ozs.  Magnesium  Sulphate. 

1  Lb.  Manganese  Dioxide. 

2  Ozs.  Mercury. 

2  Drs.  Mercuric  Chloride. 

2  Drs.  Mercuric  Oxide. 

12  Ins.  Platinum  Wire. 

\  Oz.  Phosphorus. 

|  Dr.  Potassium  (metallic). 

1  Lb.  Potassium  Bichromate. 

2  Ozs.  Potassium  Carbonate. 
|  Lb.  Potassium  Chlorate. 

1  Oz.  Potassium  Chromate. 

I  Oz.  Potassium  Cyanide. 

1  Oz.  Potassium  Ferricyanide. 

2  Ozs.  Potassium  Ferrocyanide. 
1  Oz.  Potassium  Hydrate. 

1  Dr.  Potassium  Iodide. 

2  Ozs.  Potassium  Nitrate. 

2  Drs.  Potassium  Permanganate. 

1  Oz.  Potassium  Sulphate. 

1  Dr.  Silver  Nitrate. 

1  Dr.  Sodium  (metallic). 
J  Oz.  Sodium  Acetate. 

2  Ozs.  Sodium  Carbonate. 

1  Oz.  Sodium  Hydrate. 

2  Ozs.  Sodium  Hyposulphite. 
2  Ozs.  Sodium  Sulphate. 

1  Oz.  Di-Sodium  Phosphate. 

1  Oz.  Strontium  Chloride. 

1  Oz.  Strontium  Nitrate. 

\  Lb.  Sulphur. 

J  Lb.  Zinc  for  making  Hydrogen. 


Beakers  (nest  of  4). 

Jewelers'  Blow  Pipe. 

5  Hessian  Crucibles. 

Chemical  Flask. 

Deflagration  Spoon. 

Evaporating  Dish. 

Evolution  Flask,  fitted  with  delivery  tube 
complete,  for  making  Hydrogen,  Car- 
bonic Acid  Gas,  etc. 

File. 

Filtering  Paper,  4-in.  dia. 

2-oz.  Funnel. 

8-oz.  Funnel. 

Graduate,  50  cc. 

|  Lb.  Assorted  Glass  Tubing. 

1  Gal.  Gas  Bag  and  Stopcock. 


Lead  Dish  for  Hydrofluoric  Acid. 

Pneumatic  Trough,  4  x  7  x  10. 

Pipette. 

Retort,  4-oz.  Glass. 

Retort  Stand  (iron  rings). 

Rubber  Tubing. 

Sand  Bath. 

Scales  and  Weights,  pocket,  6-in.  beam. 

Spirit  Lamp. 

Specie  Jar  for  Deflagration,  2  qt. 

1  Doz.  Test  Tubes. 

Test  Tube  Holder. 

Test  Tube  Cleaner. 

Wire  Gauze,  4x4. 

Wedgewood  Mortar  and  Pestle,  3-in. 


344 


THE  DENVER  FIRE  CLAY  COMPANY. 


No.  4120— 


CHEMICAL  SET  NO.  3.     PRICE,  $65.00. 


1  Lb. 
|  Lb. 

2  Ozs. 
2  Lbs. 
2  Lbs. 
1  Lb. 
1  Oz. 
4  Lbs. 
\  Lb. 
1  Qt. 

1  Lb. 
1  Pt. 
J  Lb. 
1  Lb. 
1  Oz. 
|  Lb. 
1  Oz. 

1  Lb. 

2  Ozs. 
i  Dr. 
1  Lb. 

1  Oz. 

2  Ozs. 
J  Oz. 
\  Lb. 

1  Oz. 

2  Ozs. 
|  Lb. 
|  Lb. 
1  Lb. 
§  Oz. 
|  Lb. 
J  Lb. 
1  Lb. 
1  Lb. 

1  Lb. 

2  Ozs. 

1  Lb. 

2  Ozs. 
2  Ozs. 
4  Ozs. 
1  Oz. 

1  Lb. 
|  Pt. 

2  Ozs. 
1  Lb. 
\  Lb. 
1  Oz. 
1  Dr. 

1  Oz. 
|  Lb. 

2  Ozs. 
4  Lb. 
1  Lb. 
\  Lb. 
1  Lb. 


Acid  Acetic. 
Acid  Boracic. 
Acid  Citric. 
Acid  Hydrochloric. 
Acid  Nitric. 
Acid  Oxalic. 
Acid  Phosphoric. 
Acid  Sulphuric. 
Acid  Tartaric. 
Alcohol  Methylic. 
Alum,  Alumina  et  Ammoni  Sulph. 
Aqua  Ammonia. 
Ammonium  Carbonate. 
Ammonium  Chloride. 
Ammonium  Molybdate. 
Ammonium  Nitrate. 
Ammonium  Oxalate. 
Ammonium  Sulphate. 
Ammonium  Sulphide. 
Aniline. 

Animal  Charcoal. 
Antimony  (metallic). 
Antimony  Sulphide. 
Arsenicum  (metallic). 
Arsenious  Anhydride. 
Asbestos. 

Barium  Carbonate. 
Barium  Chloride. 
Barium  Nitrate. 
Barium  Sulphate. 
Bismuth. 
Bone  Ash. 
Calcium  Carbonate. 
Calcium  Chloride. 
Calcium  Fluoride. 
Calcium  Sulphate. 
Carbon  Bisulphide. 
Charcoal. 
Cobalt  Chloride. 
Cobalt  Nitrate. 
Copper  Turnings. 
Copper  Nitrate. 
Copper  Sulphate. 
Ether. 

.Ferric  Chloride. 
Ferrous  Sulphate. 
Ferrous  Sulphide. 
Gall  Nuts. 
Gun  Cotton. 
Indigo. 
Iron  Filings. 
Galena. 
Lead  Acetate. 
Lead  Carbonate. 
Lead  Nitrate. 
Lead  Protoxide. 


1  Oz. 

2  Ozs. 
12  Ins. 

2  Ozs. 

1  Lb. 

2  Lbs. 
1  Oz. 
4  Ozs. 
1  Oz. 
I  Lb. 

12  Ins. 
1 

1  Oz. 
4  Ozs. 
1  Dr. 
1  Lb. 
I  Lb. 

1  Lb. 

2  Ozs. 
1  Oz. 

1  Oz. 
J  Lb. 

2  Ozs. 
2  Drs. 
|  Lb. 
1  Oz. 
4  Ozs. 

1  Lb. 

2  Drs. 
1  Oz. 

1  Dr. 

2  Drs. 
1  Oz. 
i  Lb. 
1  Oz. 

1  Lb. 

2  Lbs. 

1  Lb. 

2  Lbs. 
1  Lb. 
\  Lb. 
1  Lb. 
1  Lb. 
i  Lb. 
\  Lb. 

1  Lb. 

2  Ozs. 
2  Lbs. 
J  Lb. 
1  Oz. 
1  Pt. 

1  Lb. 

1  Lb. 
\  Lb. 
1  Lb. 


Litmus   (best  cubes). 

Logwood. 

Magnesium  Ribbon. 

Magnesium  Chloride. 

Magnesium  Sulphate. 

Manganese  Dioxide. 

Mercuric  Chloride. 

Mercury. 

Microcosmic  Salt. 

Paraffine. 

Platinum  Wire. 

Platinum  Sponge. 

Phosphorus. 

Plumbago. 

Potassium  (metallic). 

Potassium  Bichromate   (red). 

Potassium  Carbonate. 

Potassium  Chlorate. 

Potassium  Chromate  (yellow). 

Potassium  Cyanide. 

Potassium  Ferricyanide. 

Potassium  Ferrocyanide. 

Potassium  Hydrate  (sticks). 

Potassium  Iodide. 

Potassium  Nitrate. 

Potassium  Permanganate. 

Potassium  Silicate. 

Potassium  Sulphate. 

Potassium  Sulphocyanide. 

Potassium  Bitartrate. 

Silver  Nitrate. 

Sodium   (metallic). 

Sodium  Acetate. 

Sodium  Biborate. 

Sodium  Bromide. 

Sodium  Bicarbonate. 

Sodium  Carbonate. 

Sodium  Hydrate. 

Sodium  Hyposulphite. 

Sodium  Nitrate. 

Sodium  Phosphate. 

Sodium  Silicate. 

Sodium  Sulphate. 

Strontium  Carbonate. 

Strontium  Chloride. 

Strontium  Nitrate. 

Di-Sodium  Phosphate. 

Sulphur. 

Tin   (metallic). 

Tin  Protochloride. 

Turpentine. 

Zinc,  Mossy,  for  making  Hy- 

drogen. 

Zinc  Carbonate. 
Zinc  Oxide. 
Zinc  Sulphate. 


THE  DENVER  FIRE  CLAY  COMPANY. 


345 


CHEMICAL  SET  NO.  3— Continued. 


Alcohol  Lamp. 

1  Lib.  Assorted  Glass  Tubing. 

2  Doz.  Assorted  Test  Tubes. 
2  Doz.  Assorted  Corks. 

Nest  of  3  Beakers,  3  to  16  oz. 

Brass  Blow  Pipe. 

Set  of  3  Brass  Cork  Borers. 

Corkscrew. 

2  Nests  of  5  Hessian  Crucibles. 

1  Pair  Crucible  Tongs. 

1  Pt.  Chemical  Flask. 

2  4-oz.  Chemical  Flasks. 
Chemical  Thermometer. 
Balance  and  Weights. 
Brass  Deflagrating  Spoon. 
1  2-oz.  Evaporating  Dish. 
1  6-oz.  Evaporating  Dish. 

Evolution  Flask  with  Funnel  and  Delivery 

Tubes  for  making  Hydrogen,  etc. 
Triangular  File. 
Round  File. 

1  Pkg.  of  100  Cut  Filters. 
1  Pt.  Glass  Funnel. 
1  4-oz.  Glass  Funnel. 
Metric  Graduate  Glass,  100  cc. 
1  Set  (24)  Reagent  Bottles. 


1-gal.  Gas  Bag  with  Brass  Stopcock. 

Hydrometer  for  taking  specific  gravity. 

Jar  for  Hydrometer. 

Lead  Dish  for  Hydrofluoric  Acid. 

Pipette. 

Pneumatic  Trough,  4  x!  7  x  10. 

1  Pt.  Retort. 
Receiver  for  Retort. 
Iron  Retort  Stand. 

Rubber  Tubing  for  Gas  Connection. 
Reduction  Tube  for  reducing  Metallic 

Oxide. 

Polished  Steel  Spatula. 
3  Glass  Stirring  Rods. 
Sand  Bath. 

2  Specie  Jars  for  Collecting  Gases  and 
for  Deflagration. 

Test  Glass. 

Test  Tube  Rack. 

Test  Tube  Holder. 

Test  Tube  Cleaner. 

Watch  Spring  for  Burning  in  Oxygen. 

2  Safety  Tubes,  Thistle  Top. 

Iron  Wire  Gauze. 

Woulff  Bottle  with  3  necks,  pt. 

4-in.  Wedgewood  Mortar  and  Pestle. 


Collection  of  Minerals  and  Crystal  Models 

No. 

4200       Blow  Pipe  Collection. 

25  specimens,  in  hardwood  case  $1.00 

50  specimens,  in  hardwood  case  2.00 

100  specimens,  in  hardwood  case  5.00 

200  specimens,  in  hardwood  case  10.00 

4210       Scale  of  Fusibility. 

(a)  1,  Stibnite;   2,  Natrolite;   3,  Almandite;    4,  Actinolite;   5,  Ortho- 

clase;  6,  Bronzite.    In  improved  pasteboard  trays   1.50 

(b)  Large  specimens,  mounted  on  black  walnut  blocks 3.50 

4220       Scale  of  Hardness. 

(a)  1,  Talc;  2,  Gypsum;  3,  Calcite;  4,  Fluorite;  5,  Apatite;  6,  Ortho- 

clase;  7,  Quartz;   8,  Topaz;  9,  Corundum;   10,  Diamond.     With 

streak  plate  and  file.     Improved  trays  7.00 

(b)  Same,  but  smaller  specimens,  in  hardwood  case   2.50 

(c)  Same  as  foregoing,  without  diamond   1.25 

4230       Specific  Gravity. 

25  specimens,  in  neat  hardwood  case  9.00 

4240       Structure  and  Form,  results  of  imperfect  crystallization. 

1,  Columnar;  2,  Fibrous;  3,  Radiated;  4,  Reticulated;  5,  Lamellar; 
6,  Coarse  Granular;  7,  Fine  Granular;  8,  Compact;  9,  Botry- 
oidal;  10,  Mammillary;  11,  Stalactitic;  12,  Coralloidal;  13,  Con- 
cretionary; 14,  Capillary;  15,  Acicular;  16,  Amorphous.  In 
pasteboard  trays  7.00 

Large  specimens,  mounted  on  black  walnut  blocks  14.00 

4250       Cleavage. 

1,   Cubic;    2,  Octahedral;    3,  Rhombohedral;    4,   Basal;    5,   Prismatic. 

Large  specimens,  mounted  on  black  walnut  blocks 1.50 

1460       Fracture. 

1,  Even;   2,  Uneven;  3,  Conchoidal;   4,  Sub-Conchoidal;   5,  Splintery; 

6,  Hackly.    Large  specimens,  mounted  on  black  walnut  blocks.       3.50 


346  THE  DENVER  FIRE  CLAY  COMPANY. 

No. 

4270       Tenacity. 

1,  Brittle;    2,   Sectile;    3,  Malleable;    4,  Flexible;    5,  Elastic.     Large 

specimens,  mounted  on  black  walnut  blocks  $3.00 

4280       Luster. 

(a)  Kinds  of  Luster:     1,  Metallic;    2,  Sub-Metallic;   3,  Adamantine; 

4,  Vitreous;  5,  Sub-Vitreous;  6,  Resinous;  7,  Greasy;  8,  Pearly; 
9,  Metallic-Pearly  or  Metalloid;  10,  Silky;  11,  Dull,  without 
luster,  (b)  Degrees  of  Intensity  of  Luster:  12,  Splendent;  13, 
Shining;  14,  Glistening;  15,  Glimmering.  Large  specimens, 
mounted  on  black  walnut  blocks  9.00 

(b)  Same,  but  specimens  smaller  and  in  improved  pasteboard  trays.       4.50 
4290       Color. 

(a)  25  of  the  most  important  specimens  mounted  on  black  walnut 

blocks   13.50 

(b)  56   large   specimens,   illustrating  the   metallic   and   non-metallic 

colors,  mounted  on  black  walnut  blocks  30.00 

(c)  Same  as  foregoing,  but  smaller  specimens  and  in  improved  paste- 

board  trays    1 6.00 

4300       Diaphaneity. 

1.  Transparent;  2,  Semi-Transparent;  3,  Translucent;  4,  Sub-Trans- 
lucent; 5,  Opaque.  Large  specimens,  mounted  on  black  walnut 

blocks  3.00 

4310       Ores  and  Metallic  Minerals. 

25  specimens,  only  the  common  metals,  averaging  %  x  %  in.,  in  case  1.25 
25  specimens,  larger  size,  printed  labels,  in  improved  pasteboard  trays  3.00 
50  specimens,  illustrating  ores  of  both  the  common  and  rare  metals, 

in  improved  pasteboard  trays   12.00 

4320       Ores  of  the  Rarer  Metals. 

15  specimens   4.00 

25  specimens    8.50 

4330       Gold  and  Silver  Ores. 

15  specimens   12.00 

4340       Copper  Ores. 

15  specimens   3.0C 

25  specimens    7.00 

4350       Iron  Ores  and  Minerals. 

25  specimens    2.50 

50  specimens 8.50 

4360       Lead  Ores  and  Minerals. 

15  specimens   4.00 

25  specimens   12.00 

4370       Zinc  Ores  and  Minerals. 

15  specimens   4.00 

4400       Crystal  Models,  of  Celluloid. 

A  new  and  most  excellent  invention  is  this  set  of  six  crystal  models. 
They  are  made  of  transparent  celluloid  and  average  4  inches 
longest  diameter.  They  exhibit  the  six  different  systems  of 
crystallization,  and  show  various  derivative  forms  by  means  of 
internal  crystals,  also  of  celluloid.  The  axes  of  the  crystals  are 
shown  by  various  colored  silk  threads,  the  same  axis  by  the 
same  color,  different  axes  by  different  colors.  Set  of  six  in 

well  made  case  1 6.00 

4410       Crystal  Models,  of  Hard  Wood. 

108  models,  with  reference  list,  in  box  30.00 

4420       Crystal  Models,  of  Glass. 

21  cut  glass  models,  showing  the  crystallographic  forms  and  natural 

colors  of  uncut  gems,  in  case 18.00 

4430       Crystal   Models,  in  Plaster. 

100  white  models  20.00 

50  colored  faced  models,  mounted  in  brass  holders  and  again  on  hard- 
wood blocks,  label  giving  name  of  minerals  and  crystallographic 

formula    • 20.00 

100  colored  faced  models   35.00 

200  colored  faced  models   .  75.00 


THE  DENVER  FIRE  CLAY  COMPANY. 


347 


SCIENTIFIC  BOOKS 


AUTHORS'   INDEX 


Page 

Aaron    (C.   H.)    349 

Adams    (W.    J.)    361 

Addyman    (F.    T.)     350 

Adriance    (John   S.)    356 

Allen   (Alfred  H.)    350-351 

Anderson    (Jas.)     361 

Argall    (P.   H.)    349 

Austen  (P.   T.)    356 

Austin    (L.    S.)    359 

Bailar    349 

Bauerman  (H.)    361 

Bayley   (Th.)    351 

Beard    (J.   T.)    361 

Beck  (Dr.  Richard)   361 

Beringer   (C.  and  J.  J.)    349 

Betts    (Anson  G.)    359 

Blair  (A.  A.)    351 

Blount   (B.)  and  Bloxam   (G.)    351 

Bloxam  (C.  L.  and  A.  G.)    351 

Borchers   (Dr.  W.)    359 

Bosqui   (Francis  D.)    361 

Bowie   (A.  J.)    361 

Brannt  (W.  T.)  and  Wahl   (W.  H.)...  356 

Brough    (B.   H.)    364 

Brown    (W.    L.)    349 

Browning   (P.   E. )    351 

Brush  and  Penfield  350 

Buskett   (Evans  W.)    349 

Butler   (G.   M.)    361 

Cairns    (F.   A.)    351 

Carpenter  (W.   B.)    351 

Cheever  (B.  W.)    351 

Chester   (A.  H.)    361-362 

Classen  (Alexander)    351 

Classen    (H.)    351 

Clennell   (J.   E.)    362 

Coal  and  Metal  Miners'  Pocket  Book . .  362 

Cohn,  Ph.G.    (Alfred  I.)    351 

Cole-Grenville   (A.  J.)    .                           .  .  359 

Collins    (H.    F.)    .359 

Conn   (H.  W.)    351 

Cooke   (J.   F.)    356 

Cornwall  (H.  B.)    350 

Cox  (Herbert  S.)    362 

Crafts   (Prof.  I.  M.)    351 

Cremer  and  Bicknell    359 

Crookes  (Wm.)    352 

Crosby    (W.   O.)    ..'362 

Curie    (J.    H.)    362 


Page 

Dana  (E.  S.)    362 

Dana  (J.  D.)    359-362 

Davies   (D.  C.)    362 

Dobbin   (L.)  and  Walker   (J.)    356 

Eakle    (A.   S.)    356 

Egleston   (Thos.)    359-362 

Eissler  (M.)    360-362 

Eliot  (Prof.  C.  W.)  and  Storer  (Prof. 

F.  H.)    352 

Emery    (W.   D.)    352 

Englehardt  (V.)    352 

Fletcher   (E.  L,.)    349 

Fock    (A.)    362 

Foster  (C.  Le  Neve)    362 

Frazier   (S.   M.)    362 

Fresenius   and   Cohn    352 

Fresenius  and  Wells    352 

Fulton   (C.   H.)    349 

Furman  (H.  Van  F.)    349 

Garvin  (John  B.)    352 

Geikie  (J.  D.)   359 

Getman  (F.  H.)    352 

Gill  (Augustus  H.)    352 

Greenish  (H.  G.)    352 

Groves  (C.  E.)  and  Thorp  (Wm.)   356 

Hatch  (F.  H.)    ' 362 

Helm-Morgan  356 

Hempel   (W.)    352 

Hiorns  (A.  H.)    349,  360-362 

Hixon   (H.  W.)    360 

Hofman  (H.  O.)    360 

Hofman   (O.)    360 

Holleman    (Prof.  A.   F.)    356 

Hoover  (H.  C.)    363 

Hopkins   (Erastus)    357 

Hunt   (T.   S.)    359 


Ihlseng  (M.  C.)  and  Wilson 

lies   (M.   W.)    

Ingalls    (W.   R.)    


Johnson   (J.   B.)    

Johnson   (J.  C.  F.)    

Julian  (H.  F.)  and  Smart  (E.) 


363 
360 
360 

364 
363 
363 


Kemp   (J.   F.)    359 

Kent    (Wm.)    364 

Kunhardt  (W.  B.)   363 


348 


THE  DENVER  FIRE  CLAY  COMPANY, 


AUTHORS'   INDEX— Continued 


Page 

Ladd   (E.  F.)    352 

Lakes   (A.)    359-363 

Landauer  (J.)   350,  352 

Lang  (H.)    363 

Lassar-Cohn    ^57 

Leach    (Albert   E.)    352 

Le   Blanc   (M.)    352 

Le  Conte   (J.)    359 

Leffmann    (H.)    353 

Lewis   (W.   J.)    359 

Lewkowitsch   (Dr.  J.)    357 

Lieber   (Oscar  M.)    349 

Lodge   (R.   W.)    349 

Lord   (N.   W.)    353 

Louis    (Henry)    363 

Low   (Albert  H.)    349 

Luepke    (Robt.)    353 

Lunge  and  Conn   357 

Lupton    (A.)     363 

Lupton   (S.)    353 


Mac  Leod  (W.  A.) 


349 


McMillan   (W.  G.)    360 

Mandel  (J.   A.)    353 

Mason  (William  P.)    353-357 

Meade   (R.  K.)    353 

Medicus   (L.)    353 

Mendeljeff    (D.)    353 

Merck    353 

Merrill   (George  P.)    363 

Merritt    (Wm.   Hamilton)    363 

Miller   (Alfred  Stanley)    349-363 

Miller   (G.  W.)    359-363 

Miller   (John  A.)    353 

Mineral  Industry   361 

Mixter   (William  G.)    353 

Morgan   (J.),  Livingston   (R.)    357 

Morrison   (R.   S.)    363 

Morse    (Irving  H.)    353 

Moses  (A.  J.)  and  Parsons   (C.  L.)...  350 

Moses   (A.  J.)    363 

Myrick    (H.)     35S 


Naquet    (A.)     

Newth    (G.    S.)    , 

Nicholson   and  Avery 
Noyes  (A.  A.)   


Ohly   (Dr.   J.)    

Olsen  (J.  C.)    

Orton    (James)    , 

Osborn   (H.  S.)    

Osmond  (P.)  and  Stead  (J.  E.) 


353 
353 
353 
353 

353 
353 
363 
363 

360 


Ostwald   (W.)    354 

Park    (J.)     363 

Peters    (Edw.   D.)    360 

Phillips  (A.  P.)   354 

Plattner   (T.  H.)    350 

Poole    (Herman)     357 

Prescott     (Albert     B.)     and     Johnson 

(Otis  C.)    354 


Page 

Randall   (P.  M.)    363 

Remsen   (Ira)    354 

Richards    (Ellen   H.)    354 

Richards    (J.  W.)    357-360 

Richards    (R.    H.)    363 

Richardson    (G.   M.)    354 

Richter    354 

Rickard  (T.  A.)    354-360,  363-364 

Ricketts  (P.  de  P.)  and  Miller  (E.  H.)  349 
Ricketts  (P.  de  P.)  and  Russell  (S.  H.)  354 

Roscoe  (H.  E.)    357 

Roscoe   (H.  E.)  and  Schorlemmer  (C.)  358 

Rose  (T.  Kirk)    360 

Ross    (W.   A.)    350 

Rutley    (E.)    359 

Sadtler   (S.  P.)    358 

Sadtler   (S.   P.)   and  Coblenz   (V.) 358 

Schnabel   (C.)    360 

Schimpf  (H.  W.)    354 

Sexton  (A.  Humboldt)    360 

Shaler  (N.  S.)    359 

Smith   (E.  F.)    354 

Spencer    (Guilford   L.)    354 

Spurr    (J.    E.)    359 

Stillman    (T.    B.)    358 

Stetefeldt   (C.  A.)    364 

Stoughton   (Prof.   Bradley)    360 

Stretch   (R.   H.)    364 

Suplee    (H.    H.)    364 

Sutton    (F.)    354 

Talbot   (H.   P.)    355 

Thorpe  (T.  E.)    355 

Thorpe   and   Muir    355 

Thurston    (R.   H.)    361 

Tillman    (S.   E.)    355 

Trautwine   (J.  C.)    365 

Treadwell  and  Hall    355 

Tucker  (J.  H.)    355 

Turner    (Thos.)     361 

Ulke    (Titus)    361 

Ulzer  and  Fraenkel    355 

Van  Wagenen   (T.   F.)    364 

Venable  (F.  P.)  and  Howe  (J.  L.) 355 

Wagner   (Rudolph)    358 

Wallace   (J.  P.)    364 

Wanklyn   (J.  A.)    355 

Ware   (Lewis  S.)    358 

Washington    (H.    S.)    355 

Watt    358 

Watts  (W.  M.)    358 

Weed   (Walter  H.)    364 

Wells   (H.  L.)    355-358 

Wells   (J.   S.  C.)    355 

Welton    (W.   S.)    364 

Wiechmann   (F.  G.) 
Wiley  (H.  W.) 


358 
356 

Williams    (H.    TJ.)    356 

Wilson   (E.  B.)    

Wilson   (H.   M.)    

Wright   (A.   C.)    

Wurtz    (Ad.)    


364 
365 
356 
358 


THE  DENVER  FIRE  CLAY  COMPANY.  349 


SCIENTIFIC  BOOKS 


We  give  herewith  a  revised  list  of  scientific  books,  nearly  all  of  which  we  carry  in 
stock.  We  have,  on  all  of  the  various  subjects,  tried  to  select  only  the  best  and  most 
up-to-date  works,  in  both  elementary  and  advanced.  Nearly  all  publications,  formerly 
carried  by  us  and  not  given  here,  were  omitted  on  account  of  being  indefinitely  out  of 
print  and  no  prospect  of  re-publication.  All  new  works  coming  out  between  this  and 
our  next  Catalogue  will  be  taken  into  stock,  and  any  books  not  here  given  will  be 
gladly  furnished  at  publishers'  price,  if  obtainable.  We  invariably  supply  the  latest 
editions  unless  otherwise  ordered. 

All  books  are  net  at  catalogue  price,  post  paid,  to  any  address,  except  in  a  few 
instances,  where  postage  extra  is  mentioned. 


ASSAYING. 

AARON   (C.  H.),  Assaying.     Parti,  Gold  and  Silver  Ores;   6th  edition,  1906 $1.00 

Part  II,  Gold  and  Silver  Bullion;  Part  III,  Lead,  Copper,  Tin,  Mercury,  etc. 
(Part  II  and  III  in  one  volume) ;   4th  edition,  1906   1.50 

ARGALL  (P.  H.),  Mill  and  Smelter  Methods  of  Analysis;  3rd  edition,  1908 2.00 

AUSTIN  (L.  S.),  Fire  Assay  of  Gold,  Silver  and  Lead;  1907  1.00 

BAILAR,   Laboratory   Notes    1.00 

BERINGER  (C.  and  J.  J.),  A  Text  Book  of  Assaying.     With  numerous  diagrams 

and  index;  llth  edition,  456  pages,  cloth;  1906  3.00 

BROWN  (W.  L.),  Manual  of  Assaying  Gold,  Silver,  Copper  and  Lead  Ores.     With 

one  plate  and  132  illustrations;  12th  edition;  8vo,  cloth,  1907  2.50 

BUSKETT,  B.S.  (Evans  W.),  Fire  Assaying  1.25 

FLETCHER  (E.  L.),  Quantitative  Assaying  with  the  Blow  Pipe.    Leather,  1907...       1.50 
FULTON   (C.  H.),  Manual  of  Fire  Assaying;   1907   2.00 

FURMAN  (H.  Van  F.),  PARDOE  (W.  D.),  Manual  of  Practical  Assaying;  6th  edi- 
tion, 1908  3.00 

HIORNS   (A.  H.),   Practical    Metallurgy  and   Assaying.     An  excellent  treatise  on 

dry  methods  of  assaying.     Illustrated,  2nd  edition,  reprinted,  1906 1.50 

LIEBER  (Oscar  M.),  Assayer's  Guide.  For  assayers,  miners  and  smelters,  for 
the  tests  and  assays  by  heat  and  wet  processes,  for  the  ores  of  all  the  prin- 
cipal metals,  of  gold  and  silver  coins  and  alloys,  and  of  coal;  283  pages; 
12mo,  1907  1.50 

LODGE   (R.  W.),  Notes  on  Assaying  and   Metallurgical    Laboratory  Experiments, 

2nd  edition,  1908    3.00 

LOW  (Albert  H.),  Technical  Methods  of  Ore  Analysis;  4th  edition,  1909   3.00 

MAC  LEOD  (W.  A.)  and  WALKER  (C.),  Metallurgical  Analysis  and  Assaying...       4.00 

MILLER  (Alfred  Stanley),  Manual  of  Assaying.  A  work  for  beginners  and 
students  on  fire  assays  of  gold,  silver  and  lead,  including  amalgamation  and 
chlorination  tests;  3rd  edition,  142  pages,  36  figures,  cloth,  1908  1.00 

RICKETTS  (P.  de  P.)  and  MILLER  (E.  H.),  Notes  on  Assaying.  Containing  also 
rules  for  the  examination  of  mines,  assayer's  outfit,  treatment  of  ores,  etc. 
Third  revised  edition,  8vo,  cloth,  1906  3.00 


350  THE  DENVER  FIRE  CLAY  COMPANY. 


BLOW     PIPE     ANALYSIS. 

BRUSH  and  PENFIELD,  Determinative  Mineralogy  and  Blow  Pipe  Analysis;  16th 

edition,    1907    $4.00 

CORNWALL  (H.  B.),  Manual  of  Blow  Pipe  Analysis,  Quantitative  and  Qualitative. 

With  a  complete  system  of  descriptive  mineralogy;   7th  edition,  1906 2.50 

LANDAUER  (J.),  Blow  Pipe  Analysis;  with  illustrations;   1901  1.10 

MOSES    (A.  J.)    and   PARSONS    (C.   L.),    Mineralogy,   Crystallography   and    Blow 

Pipe  Analysis;  3rd  edition,  1907   2.50 

PLATTNER  (T.  H.),  Manual  of  Qualitative  and  Quantitative  Analysis  with  the 
Blow  Pipe.  From  the  last  German  edition,  revised  and  enlarged  by  Prof. 
Th.  Richter,  of  the  Royal  Saxon  Mining  Academy.  Translated  by  H.  B. 
Cornwall,  assisted  by  John  H.  Caswell;  illustrated;  8th  edition,  450  pages, 
8vo;  1902  4.00 

ROSS  (W.  A.),  Blow  Pipe  in  Chemistry,  Mineralogy  and  Geology.  Containing  all 
known  methods  of  anhydrous  analysis,  many  working  examples  and  instruc- 
tion for  making  apparatus;  120  illustrations;  214  pages,  12mo,  1905 2.00 

CHEMISTRY  —  Analytical. 

ADDYMAN  (F.  T.),  Agricultural  Analysis.   A  manual  of  quantitative  analysis  for 

students  of  agriculture    1.75 

ALLEN    F.I.C.,    F.C.S.    (Alfred    H.),    Allen's    Commercial    Organic    Analysis.      A 

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ALLEN,   F.I.C.,  F.C.S.    (Alfred  H.),  Allen's  Commercial   Organic  Analysis — (Con- 
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BLOXAM   (C.  L.  and  A.G.),  Organic  and  Inorganic  Chemistry,  with  Experiments.       6.00 

BROWNING  (P.  E.),  Introduction  to  the  Rarer  Elements;   2nd  edition,  1909 1.50 

CAIRNS  (F.  A.),  Quantitative  Chemical  Analysis;   3rd  edition  2.00 

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CHEEVER  (B.  W.),  Select  Methods  in  Inorganic  Quantitative  Analysis.  By  Byron 
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CLASSEN  (H.),  Beet  Sugar  Manufacture.    Translated  by  Hall  &  Rolfe;  1907 3.00 

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without  them. 

Vol.  I.  Statistics  to  the  end  of  1892 2.50 

Vol.  II.  Statistics  to  the  end  of  1893 5.00 

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Vol.  VI.  Statistics  to  the  end  of  1897 5.00 

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Vol.  IX.  Statistics  to  the  end  of  1900 5.00 

Vol.  X.  Statistics  to  the  end  of  1901 5.00 

Vol.  XI.  Statistics  to  the  end  of  1902 5.00 

Vol.  XII.  Statistics  to  the  end  of  1903 5.00 

ADAMS  (W.  J.)  Hints  on  Amalgamation  and  the  Care  of  Gold  Mills;  1910 2.00 

ANDERSON  (Jas.)     Prospector's  Handbook.     1902 1.50 

BAUERMAN  (H.)     Text  Book  of  Descriptive  Mineralogy;   12mo,  cloth,  1897 2.00 

BEARD  (J.  T.)  The  Ventilation  of  Mines.  By  J.  T.  Beard,  C.  E.,  E.  M.,  Secretary 
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the  subject.  12mo,  cloth 2.50 

BECK  (Dr.  Richard)  The  Nature  of  Ore  Deposits.  By  Dr.  Richard  Beck,  Professor 
of  Geology  and  Economic  Geology,  Mining  Academy  of  Freiburg.  Translated 
and  revised  by  Walter  Harvey  Weed,  formerly  of  the  U.  S.  Geological  Sur- 
vey. Two  volumes,  6x9,  illustrated  and  with  maps.  Price,  per  set 8.00 

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BUTLER  (G.  M.)     A  Pocket  Handbook  of  Minerals,  designed  for  use  in  the  field 

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CHESTER  (A.  H.)  Dictionary  of  Names  of  Minerals.  Covering  history1  and  ety- 
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CHESTER  (A.  H.)  A  Catalogue  of  Minerals,  alphabetically  arranged  with  their 
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CROSBY  (W.  O.)     Tables  for  the  Determination   of  Common    Minerals.     Fourth 

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DANA  (E.  S.)    Minerals,  How  to  Study  Them;  2nd  edition,  1908  1.50 

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rado. Fourth  edition,  1908 5.00 

JOHNSON  (J.  C.  P.)     Getting  Gold.    Fourth  edition 1.50 

JULIAN    (H.   F.)    and    SMART    (E.)      Cyaniding    Gold   and    Silver  Ores.      Second 

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KUNHARDT   (W.  B.)     The  Practice  of  Ore   Dressing  in   Europe.     By  W.  B.  Kun- 

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LUPTON  (A.)  Mining.  An  elementary  treatise  on  the  getting  of  minerals.  Illus- 
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MERRILL.  The  Non-Metallic  Minerals;  Their  Occurrence  and  Uses.  By  George 
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ing of  the  University  of  Wisconsin,  formerly  Civil  Engineer  on  the  U.  S. 
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THE  DENVER  FIRE  CLAY  COMPANY.  365 


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or  general  maps,  surveying  for  detailed  or  special  maps,  geographic  and  ex- 
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366 


THE  DENVER  FIRE  CLAY  COMPANY. 


PART  IV 


Fire  Clay  Material,  Fire  Brick,  Tile,  Etc 


Fire  Clay 


We  make  a  specialty  of  shipping  raw  fire  clay  for  metallurgical  work.  This  fire 
clay  is  of  our  very  highest  grade,  from  our  own  mines  located  above  Golden,  Colorado; 
put  up  in  bags  of  100  pounds  each  (on  the  order  of  cement),  ground,  sacked  and  ready 
for  mixing  with  water.  We  also  put  this  up  in  smaller  packages  of  10,  25  and  50  pounds, 
and  it  will  undoubtedly  pay  you  to  get  our  prices  on  this  commodity  before  purchasing, 
as  there  is  no  better  grade  of  fire  clay  sold. 

Our  Fire  Clay  and  Fire  Clay  Goods  received  the  highest  awards  at  the  Paris, 
Chicago  and  St.  Louis  Exhibits  for  quality. 


THE  DENVER  FIRE  CLAY  COMPANY. 


367 


FIRE  BRICK 


In  October,  1909,  we  received  a 
request  from  the  United  States 
government  for  twenty  fire  brick 
to  be  used  in  a  competitive  test. 
All  other  reputable  manufacturers 
of  fire  brick  were  offered  the  same 
opportunity.  We  shipped  the  brick 
as  requested,  and  in  November 
these  tests  were  completed  under 
the  expert  direction  of  Prof.  A.  V. 
Bleininger,  Ceramic  Chemist,  Tech- 
nologic Branch,  U.  S.  Geological 
Survey,  Department  of  the  Interior. 


These  twenty  brick  were  not  selected,  but  shipped  from  our  regular  factory  stock, 
and  we  are  pleased  to  be  able  to  say  that  our  brick  stood  among  the  highest  under 
all  conditions.  This  test  required  that  brick  be  subjected  to  heats  of  all  degrees,  while 


This  illustration  shows  position 
of  fire  brick  to  conform  to  U.  S. 
government  specifications. 

Pressure  of  75  Ibs.  per  square 
inch  being  applied  on  surface  of 
vertical  brick  while  being  tested 
for  heat  resisting  qualities. 


Bancroft  Library 


withstanding  a  crushing  strain  of  75  pounds  per  square  inch,  in  accordance  with  gov- 
ernment specifications.  Therefore,  when  considering  the  purchase  of  fire  brick  for  any 
purpose  requiring  infusible  and  fire-resisting  qualities,  it  will  pay  you  to  purchase  our 
No.  1  quality  and  get  a  brick  you  can  depend  upon,  and  that  will  outlast  three  of  the 
ordinary  kind.  They  are  not  cheaper,  but  to  get  the  finest  grade  of  material,  manu- 
factured in  the  best  equipped  factory  in  the  United  States,  is  it  not  worth  the  slight 
difference?  We  believe  so,  and  our  sales  testify  to  the  correctness  of  our  judgment. 


368 


THE  DENVER  FIRE  CLAY  COMPANY. 


METALLURGICAL  TILE 


We  have  had  a  great  many  calls  for  special  tile  from  manufacturers  of  furnaces 
of  all  types.  In  this  connection  we  would  advise  that  we  are  in  a  position  to  furnish 
metallurgical  tiling  of  any  design  from  blue  prints  or  sketches  on  short  notice. 

These  tile  have  the  same  high  class  quality  embodied  in  all  our  fire  clay  products. 
We  respectfully  solicit  your  inquiries  when  in  the  market  for  anything  of  a  fire  clay 
nature. 

The  following  list  of  shapes  and  sizes  describes  only  partially  those  which  we 
make.  In  fact,  we  make  everything  in  fire  clay,  and  we  are  always  glad  to  undertake 
special  work  in  the  fire  clay  line. 

If  you  do  not  find  just  what  you  want  listed,  write  us,  sending  us  preferably  a 
sketch  of  what  you  desire,  and  we  shall  be  pleased  to  make  you  an  estimate. 


THE  DENVER  FIRE  CLAY  COMPANY. 


369 


THE  EUREKA  CYLINDER  LINING 


FOR   DESULPHURIZING   CYLINDERS. 


Sectional  View  of  Lining. 


We  manufacture  the  above  Cylinder  Lining  from  4  to  5  inches  thick.  The 
projecting  bricks  are  usually  made  like  "a"  in  cut,  but  may  be  made  like  "b,"  "c," 
"d,"  "e"  or  "f"  if  preferred.  In  ores  which  are  inclined  to  matte  in  roasting,  the  smaller 
projections  are  preferable,  but  with  an  ore  that  will  free  itself  the  larger  projections 
serve  to  carry  the  ore  upward,  allowing  it  to  drop  through  the  heated  space  of  the 
cylinder,  thus  utilizing  the  heat  to  the  greatest  advantage.  As  this  lining  is  tongued 
and  grooved,  it'  can  be  made  much  thinner  than  the  other  lining.  We  have  many  of 
these  linings  in  use,  and  are  pleased  to  say  they  have  given  excellent  satisfaction. 


On  receipt  of  specifications  estimates  will  be  promptly  given. 


370 


THE  DENVER  FIRE  CLAY  COMPANY. 


Regular  9-inch  Fire  Brick 


1  —  Standard. 


4  —  Soap. 


13 — Key  or  Ringwall. 
12  ft.  Diameter  Inside. 
112   Brick  to   Circle. 


y 

19 — Wedge. 

27  in.  Diameter  Inside. 
53  Brick  to  Circle. 


7 — Arch. 

13  in.  Diameter  Inside. 
26  Brick  to  Circle. 


17  —  Wedge. 
15  ft.  Diameter  Inside. 


20 — Wedge. 

12  in.  Diameter  Inside. 
36  Brick  to  Circle. 


5 — Arch. 

36  in.  Diameter  Inside. 
54  Brick  to  Circle. 


„      .     . 
For  Lime  KUns. 


15—  Key 

3   ft.   Diameter   Inside. 
36  Brick  to  Circle 


18— Wedge. 

6   ft.  Diameter   Inside. 
105  Brick  to  Circle. 


21— End  Skew. 
Any  Angle  to  Order. 


THE  DENVER  FIRE  CLAY  COMPANY, 


371 


REGULAR  9-INCH   FIRE   BRICK— Continued. 


22 — Side  Skew. 
Any  Angle  to  Order. 


23 — Edge  Skew. 
Any  Angle  to  Order. 


24 — Jamb. 


Prices  of  Square  and  Shape  Fire  Brick  and  Clay 

(Carload  lots,  f.  o.  b.  Denver.) 

No.  1  Pressed  Fire  Brick,  per  1000  $23.00 

Shape  Brick,  not  exceeding  9  x  4%  x  2y2  inches,  per  1000   25.00 

Ground  Fire  Clay,  in  100-pound  sacks,  per  ton 5.50 


25 — Cupola  Blocks. 


CUPOLA  BLOCKS 


Outside  Diameter 
of  Lining 

Thickness 

Number 
to  Circle 

Weight 
Per  Block 

30  inches 

4£  inches 

11 

20^  pounds 

36  inches 

4£  inches 

12 

21    pounds 

40  inches 

5    inches 

14 

22    pounds 

42  inches 

4£  inches 

15 

22    pounds 

48  inches 

5    inches 

17 

24    pounds 

54  inches 

6    inches 

18 

29    pounds 

60  inches 

5    inches 

21 

24    pounds 

We  carry  in  stock  above  sizes.    Any  other  size  or  shape  made  to>  order. 


TILE 


26 — Arch  Tile 

For  the  top  of  Fire  Boxes. 

Used  for  Bake  Ovens 

Price,  $1.15. 


27— Arch  Tile 

For  the  Top  of  Fire  Boxes. 

Price,  50  cents. 


372 


THE  DENVER  FIRE  CLAY  COMPANY. 


TILE— Continued. 


28 — Flange  or  Rabbited  Tile. 

12x24x2%  in. 

12  x  24  x  3      in. 

Any  Other  Size  to  Order. 


29— Damper  or  Door  Tile. 

To  be  bound  with  iron  in  the  groove. 

Any  Size  to  Order. 


30 — Candy   and  Brass 

Furnace  Linings. 
Inside  Diameter  14  in. 
Outside  Diameter  18  in. 

6  to  Circle. 
Each,  10  cents. 


31 — Candy  and  Brass 

Furnace  Linings. 
Inside  Diameter  16  in. 
Outside  Diameter  21  in. 

6  to  Circle. 
Each,  15  cents. 


\ 


31a — Candy  and  Brass 

Furnace  Linings. 
Inside  Diameter  19  in. 
Outside  Diameter  24  in. 

6  to  Circle. 
Each,  25  cents. 


32 — Refining  or  Brass 

Furnace. 

Inside  Diameter  16  in. 

Outside  Diameter  24  in. 

6  Bricks  to  Circle— 

18  to  1  Furnace. 


32a — Refining  or  Brass 

Furnace. 

Inside  Diameter  18  in. 

Outside  Diameter  25  in. 

6  Bricks  to  Circle — 

18  to  1  Furnace. 


32b — Refining  or  Brass 

Furnace. 

Inside  Diameter  18  in. 

Outside  Diameter  28  in. 

6  Bricks  to  Circle— 

18  to  1  Furnace. 


No.  32c 


One  in  18  to  be  Flue  Tile,  No.  32,  32a  and  32b. 
Lining  complete  with  throat  piece: 

3%  4  5  inches  thick. 


$6.50 


7.00 


9.00 


32c     Flue  or  Throat  Tile,  for  Refining  or  Brass  Fur- 
naces, No.  32,  32a,  32b Each,  net     $1.50 


33 — Cylinder  Stove  Linings.    34— Plain    Stove-Back   Tile, 


1  in.  Thick. 
Outside  Diameters  9,  10,  11, 

12  and  13  in. 
5   to  Circle — 15   to  Set. 
Price,  5c  each,  or  50c  per  set. 


1  in.  Thick. 
Sizes  1  x  5  x  16  in. 
1  x  6  x  16  in. 
1x7x18  in. 
Price,  15  cents  each. 


THE  DENVER  FIRE  CLAY  COMPANY. 


373 


List  of  Rectangular  Tile  in  Stock 


Thick- 
ness 
Inches 

Width 
Inches 

Length 
Inches 

Weight 
Pounds 

Thick- 
ness 
Inches 

Width 
Inches 

Length 
Inches 

Weight 
Pounds 

Thick- 
ness 
Inches 

Width 
Inches 

Length 
Inches 

Weight 
Pounds 

1 

5 

16 

5 

2 

14 

24  . 

44 

3 

8 

22 

34 

1 

6 

16 

6 

2 

16 

16 

34 

3 

8 

24 

37 

1 

6 

18 

7 

2 

16 

18 

38 

3 

10 

18 

36 

1 

6 

20 

8 

2 

16 

22 

.47 

3 

10 

20 

39 

1 

7 

18 

8 

2 

16 

24 

51 

3 

10 

22 

43 

1 

7 

20 

9 

2 

18 

18 

43 

3 

10 

24 

47 

1 

8 

20 

10 

2 

18 

24 

59 

3 

12 

18 

42 

14 

6 

16 

10 

24 

44 

18 

13 

3 

12 

20 

47 

i* 

6 

18 

11 

2f 

44 

24 

18 

3 

12 

22 

51 

14 

6 

20 

12 

2f 

44 

28 

21 

3 

12 

24 

56 

H 

6 

22 

13 

24 

6 

18 

17 

3 

12 

30 

71 

if 

6 

24 

15 

24 

6 

22 

22 

3 

12 

36 

84 

lj 

7 

16 

12 

2f 

6 

24 

23 

3 

14 

18 

48 

if 

7 

18 

13 

2J 

7 

18 

20 

3 

14 

20 

53 

H 

7 

20 

15 

2* 

7 

20 

23 

3 

14 

22 

58 

14 

7 

22 

16 

2f 

7 

22 

25 

3 

14 

24 

63 

1* 

7 

24 

18 

2f 

7 

24 

27 

3 

14 

30 

80 

1* 

8 

16 

13 

2f 

8 

18 

24 

3 

14 

36 

99 

if 

8 

18 

15 

2* 

8 

20 

26 

3 

16 

24 

72 

l* 

8 

20 

17 

2* 

8 

22 

28 

3 

16 

36 

112 

if 

8 

22 

19 

24 

8 

24 

30 

3 

18 

18 

63 

l* 

8 

24 

21 

2* 

10 

18 

29 

3 

18 

22 

79 

14 

10 

16 

16 

2l 

10 

22 

36 

3 

18 

24 

86 

If 

10 

18 

18 

2| 

10 

24 

38 

3 

18 

36 

130 

14 

10 

20 

20 

24 

12 

12 

23 

3 

24 

24 

112 

if 

10 

22 

22 

2* 

12 

14 

27 

4 

8 

18 

37 

l* 

10 

24 

24 

2* 

12 

18 

31 

4 

8 

20 

41 

l| 

12 

24 

29 

2* 

12 

22 

43 

4 

8 

22 

45 

2 

44 

24 

14 

24 

12 

24 

46 

4 

8 

24 

50 

2 

6 

18 

14 

24 

12 

30 

56 

4 

10 

18 

47 

2 

6 

20 

16 

24 

14 

14 

31 

4 

10 

20 

52 

2 

6 

22 

17 

24 

14 

16 

41 

4 

10 

22 

56 

2 

6 

24 

19 

24 

14 

18 

44 

4 

10 

24 

61 

2 

7 

18 

17 

24 

14 

20 

47 

4 

10  ' 

30 

78 

2 

7 

20 

18 

24 

14 

30 

64 

4 

12 

18 

56 

2 

7 

22 

20 

24 

16 

16 

40 

4 

12 

20 

63 

2 

7 

24 

22 

2* 

16 

18 

46 

4 

12 

22 

68 

2 

8 

16 

16 

2* 

16 

22 

57 

4 

12 

24 

77 

2 

8 

18 

19 

2* 

16 

24 

62 

4 

12 

30 

93 

2 

8 

20 

21 

2* 

18 

18 

53 

4 

12 

36 

112 

2 

8 

22 

23 

24 

18 

22 

65 

4 

14 

18 

65 

2 

8 

24 

25 

24 

18 

24 

71 

4 

14 

20 

73 

2 

10 

18 

25 

24 

22 

24 

87 

4 

14 

22 

80 

2 

10 

20 

27 

24 

24 

24 

92 

4 

14 

24 

87 

2 

10 

22 

30 

3 

44 

20 

17 

4 

14 

30 

109 

2 

10 

24 

33 

3 

44 

22 

20 

4 

14 

36 

130 

2 

12 

12 

19 

3 

44 

24 

22 

5 

9 

9 

26 

2 

12 

14 

23 

3 

44 

28 

25 

2 

12 

16 

25 

3 

44 

30 

26 

2 

12 

18 

29 

3 

44 

36 

33 

2 

12 

20 

32 

3 

8 

18 

28 

2 

12 

22 

35 

3 

8 

20 

31 

2 

12 

24 

38 

2 

14 

18 

33 

Tiles  of  1  inch  thickness,  2  cents  per  pound;   1|/2  inches,  1]/2  cents  per  pound;  other 
sizes,  1  cent  per  pound.    Ask  for  special  quotations  for  large  quantities. 

We  shall  be  pleased  to  make  any  other  size  to  order. 


374 


THE  DENVER  FIRE  CLAY  COMPANY. 


PART  V. 


POTASSIUM  CYANIDE  AND  ZINC  SHAVINGS 


The  Cyanide  Process  for  the  recovery  of  the 
precious  metals  having  come  into  such  general 
use,  we  have  made  extensive  preparations  for 
satisfactory  service  in  the  delivery  of  Potassium 
and  Sodium  Cyanide  and  Zinc  Dust  and  Shav- 
ings, and  are  in  a  position  to  quote  prices  that 
we  feel  sure  will  be  attractive  to  the  trade.  We 
are  agents  for  the  Koessler  &  Hasslacher  Cya- 
nide and  Zinc  Dust,  and  are  one  of  the  largest, 
if  not  the  largest,  distributors  in  the  West.  The 
purity  of  the  Eoessler  &  Hasslacher  products 
is  too  well  known  to  require  comment  here. 

Our  Zinc  Shavings  are  made  from  the  purest 
of  zinc  on  a  Johnson  Water  Cooled  Lathe,  and 
have  met  with  such  favor  that  our  business  in 
this  line  has  grown  very  rapidly,  enabling  us  to 
cut  and  sell  in  sufficient  quantities  to  reduce  the 
price  to  the  minimum.  They  have  become  the 
standard  of  excellence  because  we  have  made  it 
our  business  to  meet  every  requirement  the 
thread  should  answer  to  give  the  greatest  effi- 
ciency as  a  precipitating  agent,  and  have  con- 
formed as  nearly  as  possible  to  these  require- 
ments. 

We  are  prepared  to  contract  for  any  quan- 
tity, delivery  to  be  made  in  lots  at  stated  inter- 
vals, enabling  the  consumer  to  receive  shavings 
freshly  cut  and  free  from  oxidation  at  all  times, 
a  matter  of  great  importance  in  the  precipita- 
tion of  the  precious  metals  by  this  method.  We 
court  inquiry  and  investigation  of  these  Shav- 
ings. They  are  made  by  experts  in  an  expert 
way,  and  we  know  they  are  right. 


THE  DENVER  FIRE  CLAY  COMPANY.  375 

Prices  Current  of  Chemicals  and  Reagents 

Kept  in  Stock  and  for  Sate  by 

THE  DENVER  FIRE  CLAY  COMPANY 

Denver,  Colorado,  U.  S.  A. 


N.  B. — Prices  subject  to  market  variations.  For  quantities  less  than  a 
quarter  pound  the  ounce  price  will  be  charged.  Merck's,  Baker  &  Adamson's, 
J.  T.  Baker's  and  Mallinckrodt's  chemicals  in  stock. 


Cost  of  BOTTLES  and  other  containers  INCLUDED,  unless  otherwise  stated. 

Pound.      Ounce. 

Acetamide   $  4.00  $0.40 

Acetanilid    50  .10 

Acetone 50 

Acetone,  highest  purity .80  .15 

Acetyl  Bromide .80 

Acetyl  Chloride    .30 

Acetyl  Iodide  ^. .  1 .00 

Acid  Acetic,  com'l,  No.  8,  30% Bottle,  $0.09        .10 

Acid  Acetic,  pure,  30% Bottle     .09        .15 

Acid  Acetic,  pure,  60% Bottle      .09        .20 

Acid  Acetic,  glacial,  80% ' Bottle     .09        .25 

Acid  Acetic,  chem.  pure,  99%% Bottle     .09        .35 

Acid  Acetic,  anhydrous 1 .80  .30 

Acid  Antimonic  (Antimony  pentoxide)  c.  p 1.10  .20 

Acid  Antimonious  (Antimony  trioxide)  c.  p 1.10  .20 

Acid  Arsenicic,  chem.  pure '. .85  .15 

Acid  Arsenious,  com'l,  powder  (Arsenic  trioxide) .15 

Acid  Arsenious,  pure,  lumps .40  .15 

Acid  Arsenious,  pure,  powder 40  .15 

Acid  Arsenious,  chem.  pure .60  .15 

Acid  Asparaginic 3.00 

Containers  Included   Unless  Otherwise  Specified. 


376  THE  DENVER  FIRE  CLAY  COMPANY. 

Pound.       Ounce. 

Acid  Benzole,  from  gum  benzoin,  subl $  1.50        $  0.20 

Acid  Benzoic,  from  toluene   70  .10 

Acid  Boric,  coni'l,  cryst .25              .10 

Acid  Boric,  com'l,  powder .25               .10 

Acid  Boric,  cryst.,  chem.   pure    Carton  .35               .10 

Acid  Boric,  powder,  chem.  pure    Carton  .35               .10 

Acid  Boric,  fused,  chem.  pure 1.50               .20 

Acid  Boro-Wolframic  (boro-tungstic),  sp.  g.  2.6 1.50 

Acid  Bromic,  sp.  g.  1.120 3.50               .35 

Acid  Carbolic,  crude,  50% Can,  $0.15;   gal.,  $0.60 

Acid  Carbolic,  white,  cryst.,  pure 40 

Acid  Carbolic,  loose,  cryst.,  chem.  pure .75               .20 

Acid  Carbonic,  liquefied,  in  steel  cylinders  of  18  pounds .25 

Acid  Carminic,  chem.   pure 3.50 

Acid  Catechic,  pure .80 

Acid  Chloric,  1.12  sp.gr .30 

Acid  Chloroplatinic Gram.,  $0.80 

Acid  Chromic,  com'l,  for  batteries    Bottle,     .15  .40 

Acid  Chromic,  pure,  cryst Bottle,      .15  .70 

Acid  Chromic,  chem.  pure,  cryst.,  free  from  H,SO4 Bottle,      .15  1.60               .25 

Acid  Citric,  cryst.,  purified .70               .10 

Acid,  Citric,  cryst.,  chem.  pure   1.20               .20 

Acid  Formic,  pure,  1.06  (25%) Bottle,  $0.15  .60               .20 

Acid  Formic,  pure,  1.12  (50%) Bottle,      .15  .70              .20 

Acid  Formic,  pure,  1.20  (90%) Bottle,      .15  1.25               .25 

Acid  Gallic,  cryst.,  pure 90  .15 

Acid  Hydrobromic,  sp.  g.  1.20,  chem.  pure Bottle,  $0.15  1.00               .20 

Acid  Hydrobromic,  sp.  g.  1.49,  chem.  pure Bottle,      .15  2.00               .25 

Acid  Hydrobromic,  sp.  g.  1.78,  chem.  pure Bottle,      .15  5.00              .50 

Acid  Hydrobromic,  diluted,  sp.  g.  1.077,  U.  S.  P Bottle,      .10  .35               .15 

Acid  Hydrochloric,  com'l,  22°  B.,  in  1-lb.  bottles Bottle,      .15  .10 

Acid  Hydrochloric,  com'l,  22°  B.,  in  6-lb.  bottles Bottle,      .25  .06 

Acid  Hydrochloric,  com'l,  22°  B.,  in  carboys Carboy,  2.00  .03 

Acid  Hydrochloric,  strictly  chem.  pure,  sp.  g.  1.20,  free  from  As,  Cl,  Fe 

and  S.,  in  1-lb.  bottles incl.  .35 

Acid  Hydrochloric,  strictly  chem.  pure,  sp.  g.  1.20,  free  from  As,  Cl,  Fe 

and  S.,  in  6-lb.  bottles incl.  .20 

Acid  Hydrochloric,  strictly  chem.  pure,  sp.  g.  1.20,  free  from  As,  Cl,  Fe 

and  S.,  in  carboys incl.  .12 

Acid  Hydrocyanic,  diluted,  U.  S.  P.— 2% '.  ,60               .15 

Acid  Hydrofluoric,  chem.  pure,  B.  &  A.'s,  in  1-lb.  Ceresine  bottles. .  .incl.  1.50               .25 

Acid  Hydrofluoric,  chem.  pure,  B.  &  A.'s,  in  %-lb.  Ceresine  bottles. .  .incl.  1.60 

Containers   Included   Unless  Otherwise  Specified. 


THE  DENVER  FIRE  CLAY  COMPANY.  377 


Pound.      Ounce. 

Acid  Hydrofluoric,  chem.  pure,  B.  &  A.'s,  in  }£-lb.  Ceresine  bottles.  .  .incl.     $2.00 

Acid  Hydrofluoric,  com'l,  B.  &  A.'s,  in  1-lb.  Ceresine  bottles incl.        .80          $0.15 

Acid  Hydrofluoric,  com'l,  B.  &  A.'s,  in  y2-Yb.  Ceresine  bottles 1.00 

Acid  Hydrofluoric,  com'l,  B.  &  A.'s,  in  }4-lb.  Ceresine  bottles 1.40 

Acid  Hydrofluorsilicic,  com'l,  1.16  sp.  gr Bottle,  $0.15         .50  .20 

Acid  Hydrofluorsilicic,  chem.  pure Bottle,      .15      2.00  .30 

Acid  Hydroiodic,  1.50  sp.gr .50 

Acid  Hydroiodic,  15%   Bottle,  $0.15       1.00  .30 

Acid  Hypophosphorus,  30% 1.20  .20 

Acid  lodic,  cryst .90 

Acid  lodic,  anhydrous 1 .20 

Acid  Lactic,  cone.,  pure 1.00  .15 

Acid  Malic  1.00 

Acid  Malonic   .80 

Acid  Meconic 1 .75 

Acid  Molybdic,  chem.  pure,  free  from  ammonia 3.50  .40 

Acid  Molybdic,  pure,  85% 2.00  .25 

Acid  Monobromacetic  .75 

Acid  Monochloracetic,  pure 2.00  .25 

Acid  Mucic  .50 

Acid  Muriatic.     (See  Acid  Hydrochloric.) 

Acid  Nitric,  com'l,  38°  Be,  in  1-lb.  bottles Bottle,  $0.15        .15 

Acid  Nitric,  com'l,  38°  Be,  in  7-lb.  bottles Bottle,      .25         .12 

Acid  Nitric,  com'l,  38°  Be,  in  carboys Carboy,  2.00        .10 

Acid  Nitric,  strictly  chem.  pure,  sp.  g.  1.42,  free  from  As,  Fe,  Cl,  and  S,  in 

1-lb .  bottles incl.        .35 

Acid  Nitric,  strictly  chem.  pure,  sp.  g.  1.42,  free  from  As,  Fe,  Cl,  and  S,  in 

7-lb.  bottles incl.         .20 

Acid  Nitric,  strictly  chem.  pure,  sp.  g.  1.42,  free  from  As,  Fe,  Cl,  and  S,  in 

carboys   incl.  .  1 4 

Acid  Nitric,  fuming,  com'l,  1.60 Bottle,  $0.15  .60 

Acid  Nitric,  fuming,  chem.  pure,  sp.  g.  1.60 Bottle,      .15  .80 

Acid  Oleic  (oleinic) ,  com'l Bottle,      .09  .25 

Acid  Oleic  (oleinic) ,  pure .60 

Acid  Oleic  (oleinic),  chem.  pure .50 

Acid  Osmic,  cryst 1-gramme  vial,  $3.00 

Acid  Oxalic,   com'l .15 

Acid  Oxalic,  chem.  pure Carton  .45              .10 

Acid  Palmitic,  pure .60 

Acid  Perchloric,   pure 5.00               .50 

Acid  Phospho-Antimonic,  10%  solution '  .30 

Containers   Included   Unless  Otherwise  Specified. 


378  THE  DENVER  FIRE  CLAY  COMPANY. 


Pound.      Ounce. 

Acid  Phospho-Molybdic,  cryst $1.20 

Acid  Phospho-Molybdic,  10%  solution $1.25  .25 

Acid  Phospho-Tungstic  (phospho-wolframic),  cryst 4.00  .45 

Acid  Phospho-Tungstic  {phospho-wolframic),  10%  solution 2.00  .25 

Acid  Phosphoric,  anhydrous   (P2O3) Bottle,  $0.20  1.25  .25 

Acid  Phosphoric,  glacial,  in  sticks   (meta-) .80  .15 

Acid  Phosphoric,  syrupy,  85%   (ortho-) Bottle,  $0.15  .50  .15 

Acid  Phosphoric,  diluted,  10% Bottle,      .09  .20 

Acid  Phosphoric,  diluted,  50% Bottle,      .09  .35 

Acid  Phosphorus,  sp.  g.  1.120   2.00  .30 

Acid  Phtalic,  anhydrous,  subl .25 

Acid  Phtalic,  cryst.,  chem.  pure .35 

Acid  Picric   (carbazotic),  pure 1.00  .20 

Acid  Picric  (carbazotic) ,  com'l .55  .10 

Acid  Propionic,  pure .65 

Acid  Prussic.     (See  Acid  Hydrocyanic.) 

Acid  Pyrogallic,  resublimed,  Mallinckrodt's,  1-lb.  tins 2.50  .30 

Acid  Pyrogallic,  resublimed,  Mallinckrodt's,  ^-lb.  tins 2.70 

Acid  Pyrogallic,  resublimed,  Mallinckrodt's,  ^-Ib.  tins 3.00 

Acid  Pyroligneous,  rectified .40 

Acid  Pyrophosphoric .35 

Acid  Rosolic 2.00  .30 

Acid  Salicylic  Carton  .60  .10 

Acid  Salicylous  .60 

Acid  Selenic,  sp.  g.  1.40 %  oz.,  $0.60  4.00 

Acid  Selenous,  subl %  oz.,    1 .00 

Acid  Silicic,  precip .60  .12 

Acid  Silicic,  chem.  pure   ,. . . .  .90  .15 

Acid   Silicic,  com'l    10 

Acid  Stearic,  com'l .30 

Acid  Stearic,  chem.  pure .50 

Acid  Stibic,  chem.  pure   1.10  .20 

Acid  Stibious,  chem.  pure   1.10  .20 

Acid  Succinic,  crude .60 

Acid  Succinic,  pure .75 

Acid  Sulphanilic,  white  cryst 2.00  .25 

Acid  Sulpho-salicylic    .40 

Acid  Sulphuric,  com'l,  66°  B.,  in  1-lb.  bottles Bottle,  $0.15  .10 

Acid  Sulphuric,  com'l,  66°  B.,  in  9-lb.  bottles Bottle,     .25  .06 

Acid  Sulphuric,  com'l,  66°  B.,  in  carboys  Carboy,   2.00  .03 

Acid  Sulphuric,  com'l,  66°  B.,  in  drums  of  1,600  Ibs.  (drum,  $8.00) 02 

Containers   Included   Unless  Otherwise  Specified. 


THE  DENVER  FIRE  CLAY  COMPANY. 


379 


Pound.      Ounce. 
Acid  Sulphuric,  strictly  chem.  pure,  sp.  g.  1.845,  free  from  As,  N,  SO2  and 

organic  matter,  in  1-lb.  bottles incl.     $0.35 

Acid  Sulphuric,  strictly  chem.  pure,  sp.  g.  1.845,  free  from  As,  N,  SO2  and 

organic  matter,  in  9-lb.  bottles incl.        .18 

Acid  Sulphuric,  strictly  chem.  pure,  sp.  g.  1.845,  free  from  As,  N,  SO,  and 

organic  matter,  in  carboys .incl.        .12 

Acid  Sulphuric,  anhydr 2.00 

Acid  Sulphuric,  anhydrous,  in  sealed  glass  bulbs  of  about  100  grammes. .         .50 

Acid  Sulphuric,  fuming,  Nordhausen Bottle,  $0.15         .35 

Acid  Sulphurous,  U.  S.  P Bottle,      .15         .20 

Acid  Sulphurous,  chem.  pure,  B.  &  A.'s Bottle,     .15        .25 

Acid  Tannic  (Tannin) Carton       1.00  $0.15 

Acid  Tannic,  chem.  pure Carton       1 .80  .20 

Acid  Tartaric,   cryst .50 

Acid  Tartaric,  powder .55 

Acid  Tartaric,  chem.  pure,  cryst .90  .15 

Acid  Tartaric,  chem.  pure,  powder 1.00  .15 

Acid  Telluric    Grm.,  $1.50  35.00 

Acid  Titanic .70 

Acid  Trichloracetic    3.50  .35 

Acid  Tungstic  (wolframic),  technical 1.50  .20 

Acid  Tungstic  (wolframic),  chem.  pure .40 

Acid  Uranic,  pure .75 

Acid  Uric,  pure .80 

Acid  Vanadic,  chem.  pure %  oz.,  $0.45  3.00 

Acid  Vanadic,  technical 1 .50 

Acid  Wolframic.     (See  Acid  Tungstic.) 

Agar  Agar,  in  shreds 1 .00 

Agar  Agar,  in  powder 1 .50 

Albumen,  from  blood,  chem.  pure .45 

Albumen,  from  eggs,  soluble,  impalpable  powder   1.60  .20 

Alcannin  .50 

Alcohol,  95% Container  extra Pint,  $0.50 

Alcohol,  95% Container  extra Quart,    .90 

Alcohol,  95% Container  extra Gal.,     3.20 

Alcohol  Absolute    Pint,      .80 

Alcohol  Absolute Quart,  1 .50 

Alcohol  Absolute    Gal.,     5.75 

Alcohol  Amylic,  com'l  (fusel  oil) Gal.,     2.50 

Alcohol  Amylic,  chem.  pure 1.00 

Alcohol  Methyl  (wood  alcohol),  95% Container  extra Gal.,       .80 

Alcohol  Methyl  (wood  alcohol),  absolute.  .Container  extra Gal.,     1.25 

Alcohol  Methyl  (wood  alcohol), deodorized  (Columbian Spirits),  Gal.,     1.20 

Containers   Included   Unless  Otherwise  Specified. 


380  THE  DENVER  FIRE  CLAY  COMPANY. 


Pound.      Ounce. 

Alcohol  Methyl,  chem.  pure $1 .00 

Alcohol   Denatured    Gal.,  $0.80 

Formula  100  Parts  Ethyl  Alcohol     \   T 

10  Parts  Methyl  Alcohol        For  barrel1s  andf  *  barrels« 
%  of      1  Part  Benzine  }          special  W°^°™- 

Aldehyde,  cone 1.50          $0.20 

Alizarin,  dry .50 

Alizarin,  paste,  20% 60  .15 

Alazarin,  Soda  Sulfonate   .30 

Alum,  com'l,  in  lumps .10 

Alum,  com'l,  in  powder .10 

Alum  Ammoniacal,  chem.  pure    .30 

Alum  Chromic,  com'l  (chrome-alum) .15 

Alum  Chromic,  com'l,  powder .20 

Alum  Chromic,  chem.  pure .40 

Alum  Ferric,  chem.  pure .60 

Alum  Potassic,  chem.  pure .30 

Alum  Sodic,  chem.  pure .60 

Aluminum,  metal,  ingots .75 

Aluminum,  metal,  powder,  coarse 1 .20              .20 

Aluminum,  metal,  powder,  fine 1.50              .20 

Aluminum,  metal,  sheet,  up  to  No.  28 .80              .10 

Aluminum,  metal,  sheet,  No.  34 1.00              .15 

Aluminum,  metal,  wire,  up  to  No.  16 .80              .10 

Aluminum,  metal,  wire,  No.  20 90  .15 

Aluminum,  metal,  sheet,  1-16  inch,  99.7%  pure,  impurities  all  silicon  with 

traces  of  iron .80              .10 

Aluminum  Leaf,  5  x  5  in Small  book,  $0.15 

Aluminum  Acetate,  chem.  pure 1.00              .15 

Aluminum  Aceto-tartrate    1 .50               .20 

Aluminum  Chloride,  cryst,  chem.  pure 1.25              .15 

Aluminum  Fluoride,  chem.  pure,  dry 2.00              .30 

Aluminum  Nitrate,  cryst.,  chem.  pure 1.00              .15 

Aluminum  Nitrate,  dry,  chem.  pure 1.40              .20 

Aluminum  Oxide,  hydrated,  com'l .25              .10 

Aluminum  Oxide,  hydrated,  pure 1.00              .15 

Aluminum  Oxide,  hydrated,  chem.  pure 1 .75              .20 

Aluminum  Oxide,  chem.  pure 1.80              .25 

Aluminum  Phosphate,  chem.  pure 1.80              .25 

Aluminum  Silicate,  pure 2.00               .25 

Aluminum  Sulphate,  com'l .10 

Aluminum  Sulphate,  pure .50              .10 

Aluminum  Sulphate,  cryst.,  chem.  pure .90              .15 

Containers   Included   Unless  Otherwise  Specified. 


THE  DENVER  FIRE  CLAY  COMPANY.  381 


Pound.      Ounce. 

Aluminum  Tartrate,  chem.  pure $2.50           $0.35 

Aluminum  and  Sodium  Chloride,  chem.  pure 60  .25 

Amalgams.     (See  their  respective  metals.) 
Ammonia  Water.     (See  Ammonium  Hydrate.) 

Ammonium  Acetate,  cryst.,  chem.  pure .80              .15 

Ammonium  Arsenate,  chem.  pure 1.50              .25 

Ammonium  Arsenite,  chem.  pure 1.40              .25 

Ammonium  Bicarbonate,  chem.  pure .85              .15 

Ammonium  Bichromate,  chem.  pure .80              .15 

Ammonium  Binoxalate  .80              .15 

Ammonium  Bisulphate,  pure .85              .20 

Ammonium  Bisulphite,  pure 2.25               .25 

Ammonium  Bromide .50              .15 

Ammonium  Bromide,  chem.  pure 1 .60              .20 

Ammonium  Carbonate,  resublimed,  pure,  5-lb.  cans .25 

Ammonium  Carbonate,  resublimed,  powdered,  5-lb.  cans 25 

Ammonium  Carbonate,  chem.  pure .50              .10 

Ammonium  Chloride,  granul.,  purified .15 

Ammonium  Chloride,  lumps 20 

Ammonium  Chloride,  granul.,  pure Carton  .30              .10 

Ammonium  Chloride,  chem.  pure,  hydc.  free 50 

Ammonium  Chromate,  chem.  pure 2.00              .25 

Ammonium  Citrate    1.50              .20 

Ammonium  Fluoride,  chem.  pure 2.00              .25 

Ammonium  Formate,  pure .30 

Ammonium  Hydrate  (aqua  ammonia),  cone.,  26°  B.,  in  1-lb.  bottles,  incl.  .30 

Ammonium  Hydrate  (aqua  ammonia),  cone.,  26°  B.,  in  4-lb.  bottles,  incl.  .18 

Ammonium  Hydrate  (aqua  ammonia),  cone.,  26°  B.,  in  carboys incl.  .10 

Ammonium  Hydrate,  strictly  chem.  pure,  in  1-lb.  bottles incl.  .35 

Ammonium  Hydrate,  strictly  chem.  pure,  in  4^-lb.  bottles incl.  .23 

Ammonium  Hydrate,  strictly  chem.  pure,  in  carboys incl.  .16 

Ammonium  Hydrosulphide  (solution),  Mall Bottle,  $0.15  .35 

Ammonium  Hydrosulphide   (solution),  Merck's   Bottle,      .15  .40 

Ammonium  Hypophosphite    .25 

Ammonium  Hyposulphite   (thiosulphate)    1.50              .20 

Ammonium   Iodide    4.50               .45 

Ammonium  Molybdate,  chem.  pure 2.00              .25 

Ammonium  Nitrate,  granul .30 

Ammonium  Nitrate,  cryst,  chem.  pure .55              .15 

Ammonium  Nitrite,  liquid 1.10              .20 

Ammonium  Oxalate,  chem.  pure  .60              .15 

Ammonium  Persulphate 1 .20               .20 

Containers   Included   Unless  Otherwise  Specified. 


382 


THE  DENVER  FIRE  CLAY  COMPANY. 


Pound.      Ounce. 

Ammonium  Phosphate  $0.30 

Ammonium  Phosphate,  pure,  granular  .70          $0.10 

Ammonium  Phosphate,  chem.  pure,  (dibasic)  1.00              .20 

Ammonium  Phosphite,  pure  .50 

Ammonium  Phospho-Molybdate 1.00 

Ammonium  Picrate,  pure 2.00               .25 

Ammonium  Salicylate .20 

Ammonium  Succinate,  cryst.,  pure 10.00            1.00 

Ammonium  Sulphate,  com'l   .10 

Ammonium  Sulphate,  chem.  pure 35  .10 

Ammonium  Sulphide,  Mall Bottle,  $0.15  .35 

Ammonium  Sulphite,  cryst.,  chem.  pure  1.40               .20 

Ammonium  Sulphocyanate,  pure. .75               .15 

Ammonium  Tartrate,  pure   1 .50               .20 

Ammonium  Thiosulphate    1.50              .20 

Ammonium  Tungstate  (Wolframate),  pure  .35 

Ammonium  Vanadate,  pure 1.10 

Ammonium  and  Sodium  Phosphate,  chem.  pure .80              .15 

Ammonium  Double  Salts.     (See  under  their  respective  metals.) 

Amygdalin    1.10 

Amyl  Acetate  ("pear  oil"),  pure  1.00              .20 

Amyl  Acetate,  chem.  pure 2.00              .40 

Amyl   Nitrate    .45 

Amyl  Nitrite   2.50               .30 

Amylen  Hydrate,  pure  .60 

Amylum  Iodide  or  Iodized  Star*ch .35 

Aniline  (Aniline  Oil),  white,  pure .60              .15 

Aniline  Acetate .30 

Aniline  Chloride 50  .15 

Aniline  Nitrate  .25 

Aniline  Oxalate .25 

Aniline  Sulphate    .25 

Aniline  Colors  (coal  tar  dyes) : 

Black  Nigrosine,  soluble  in  water  1.50              .25 

Black,  Nigrosine,  soluble  in  alcohol 2.00              .30 

Blue   .30 

Blue,  Methyl .75 

Blue,  Methylene  .50 

Blue,  Pearline  1 .50               .20 

Brown,  Bismarck  1 .50              .30 

Green,  Malachite 1.50              .35 

Green,  Methyl  .30 

Containers  Included  Unless  Otherwise  Specified. 


THE  DENVER  FIRE  CLAY  COMPANY. 

Aniline  Colors  (coal  tar  dyes) — Continued.  Pound.      Ounce. 

Green,  Brilliant   $1.50          $0.30 

Orange,  Methyl,  Indicator  .40 

Orange,  "G" .30 

Red,  Fuchsine,  large  cryst 1 .60              .35 

Red,  Congo  Red .35 

Red,  Coraline  .35 

Red,  Eosine  .35 

Red,  Safranine  .35 

Rose,  Bengal  ". .  .80 

Violet,  Gentian  .35 

Violet,  Methyl .35 

Violet,  Hofmann's    .40 

Yellow,  Martius' .30 

Anthrachinone,  pure .50 

Antimony,  metal,  com'l,  "Regulus"   35 

Antimony,  metal,  com'l,  powder  .40 

Antimony,  metal,  chem.  pure 1.50              .15 

Antimony,  metal,  chem.  pure,  in  sticks 2.00              .20 

Antimony  Arsenate .30 

Antimony  Arsenite   .30 

Antimony  Chloride,  cryst.,  pure  (antimonious  trichloride)   1.50              .25 

Antimony  Chloride,  solution  (butter  of  antimony)   Bottle,  $0.15  .30 

Antimony  Chloride,  Antimonic  (pentachloride),  chem.  pure 2.00              .30 

Antimony  Oxide,  white 60  .15 

Antimony  Oxide  (antimonic  or  stibic  acid)  Sb2O5,  chem.  pure 1.00              .20 

Antimony  Oxide  (antimonious  or  stibious  acid)  Sb2O3,  chem.  pure 1.00              .20 

Antimony  Oxychloride 1.50              .30 

Antimony  Sulphate,  chem.  pure  1.00              .15 

Antimony  Sulphide,  golden  (antimonic  penta-sulphide)   .50              .10 

Antimony  Sulphide,  black  (antimonious  trisulphide)   .60              .15 

Antimony  Sulphide,  red,  chem.  pure 1.60              .20 

Antimony  and  Potassium  Tartrate,  cryst.,  chem.  pure .70              .15 

Antimony  and  Potassium  Tartrate  powder  (tartar  emetic)   .50              .10 

Aqua  Ammonia.     (See  Ammonium  Hydrate.) 

Argols,  red  powd 5  Ibs.,  $0.12  .15 

Arsenic,  metal,  pure,  cryst .60 

Arsenic  Bromide,  cryst .35 

Arsenic  Chloride 3.00               .50 

Arsenic  Iodide,  pure,  cryst .60 

Arsenic  Phosphide 1.00 

Arsenic  Sulphide,  red  powder  (Realgar)   .40 

Arsenic  Sulphide,  yellow  powder  (Orpiment)   .35 

Containers  Included  Unless  Otherwise  Specified. 


384  THE  DENVER  FIRE  CLAY  COMPANY. 


Pound.       Ounce. 

Asbestos  Cement  Per  10-lb.  can,  $1.00 

Asbestos  Pulp  . .10 

Asbestos,  short  fibre .30 

Asbestos,  long  fibre,  white,  select 1.50          $0.15 

Asbestos,  washed  in  acid  2.00 

Asbestos,  washed  in  acid  and  ignited 2.50              .25 

Asbestos,  platinized,  5% 4.00 

Asparagin   1 .00 

Asphaltum    .25 

Azobenzole   (azobenzene),  pure   .50 

Balsam  Fir,  pure  (Canada  Balsam) .75              .15 

Balsam  Fir,  clear,  filtered 1 .50              .20 

Balsam  Fir,  dry,  hard 3.50              .30 

Barium  Acetate,  chem.  pure .90               .20 

Barium  Bromide  .35 

Barium  Carbonate,  precip .20 

Barium  Carbonate,  chem.  pure .70              .15 

Barium  Chlorate,  chem.  pure .80               .15 

Barium  Chloride,  com'l .12 

Barium  Chloride,  chem.  pure Carton  .30 

Barium  Chromate,  chem.  pure .90              .20 

Barium  Fluoride,  chem.  pure 1 .00              .20 

Barium  Hypophosphite .40 

Barium  Hyposulphite  (thiosulphate),  chem.  pure .35 

Barium  lodate  .75 

Barium  Iodide   .60 

Barium  Nitrate,    cryst .20 

Barium  Nitrate,   powd .20 

Barium  Nitrate,  cryst.,  chem.  pure .40              .10 

Barium  Oxalate,  pure 1 .00               .15 

Barium  Oxide,  hydrated  (caustic),  chem.  pure .60              .15 

Barium  Oxide,  hydrated  (caustic),  chem.  pure,  dry .80              ,20 

Barium  Oxide,  anhydrous,  pure .60              .15 

Barium  Peroxide,  anhydrous .45               .15 

Barium  Peroxide,  anhydrous,  pure .70              .15 

Barium  Phosphate,  chem.  pure 1.80              .25 

Barium  Sulphate,  native  (barytes,  heavy  spar) 10 

Barium  Sulphate,  native,  powder .10 

Barium  Sulphate,  precipitated,  pure .40 

Barium  Sulphide,  com'l 30 

Barium  Sulphide,  chem.  pure .80              .15 

Barium  Sulphocyanate,  pure 1.00              .15 

Containers  Included   Unless  Otherwise  Specified. 


THE  DENVER  FIRE  CLAY  COMPANY.  385 


Pound.       Ounce. 
Barium  Thiosulphate,  chem.  pure $0.35 

Battery  Fluid Bottle,  $0.30;  gal.,  $0.75 

Bauxite $0.20 

Benzaldehyde    1.25  .20 

Benzine  (petroleum  naphtha)   Can,  $0.20;  gal.,  $0.35 

Benzine,  chem.  pure .80 

Benzol  (benzene,  coal  naphtha),  purif.,  90%  Gal.,  $1.50        .30 

Benzole,  chem.  pure,  crystallizable 60  .15 

Benzoyl  Chloride,  pure .40 

Benzyl  Chloride,  pure .25 

Beryllium   Metal    1-10  grm.,  $1 .25 

Beryllium  Carbonate  1  grm.,      .20 

Beryllium  Chloride  1  grm.,      .20 

Beryllium  Oxide,  hydrated 1  grm.,      .20 

Beryllium  Oxide,   anhydrous 1  grm.,      .20 

Beryllium  Sulphate    1  grm.,      .20 

Bismuth,  metal,  pure   3.00  .30 

Bismuth,  metal,  chem.  pure 4.00  .40 

Bismuth  Bromide  .50 

Bismuth    Carbonate    5.00  .50 

Bismuth  Chloride 5.00  .50 

Bismuth  Iodide .80 

Bismuth  Nitrate,  cryst 2.50  .30 

Bismuth  Oxide,  anhydrous 5.00  .50 

Bismuth  Oxide,   hydrated 5.00  .50 

Bismuth  Oxychloride   3.00  .30 

Bismuth  Phosphate   4.00  .40 

Bismuth  Subcarbonate  (oxycarbonate)  3.00  .30 

Bismuth  Subnitrate  2.50  .25 

Bismuth  Sulphate 4.50  .45 

Bismuth  Tannate   3.00  .30 

Black  Flux  (Plattner's) 1.75  .20 

Bone  Ash,  superior  quality .08 

Bone  Ash 25,  50  and  100-lb.  boxes        .05 

Bone  Ash.    In  bbl.,  special  rates. 

Bone  Ash,  washed .40 

Bone  Black.     (See  Charcoal,  Animal.) 

Borax,  refined,  crystals .15 

Borax,  refined,  crystals 25  and  50-lb.  boxes        .10 

Borax,  refined,  powdered    .15 

Borax,  refined,  powdered 25  and  50-lb.  boxes        .10 

Borax  Glass,  powdered .25 

Containers  Included   Unless  Otherwise  Specified. 


386  THE  DENVER  FIRE  CLAY  COMPANY. 


Pound.       Ounce. 

Borax  Glass,  powdered 25,  50  and  100- Ib.  boxes  $0.25 

Borax  Glass.    In  bbl.,  special  rates. 

Brazil  wood 25 

Bromine  1'  Ib.  inc.  tin  and  g.  s.  b.  1.00          $0.25 

Bromine  %  Ib.  inc.  tin  and  g.  s.  b.  1.20 

Bromine  %  Ib.  inc.  tin  and  g.  s.  b.  1.50 

Bromine  Chloride .70 

Bromoform .25 

Brucine,  pure Dram,  $0.25  1.80 

Cadmium,  metal,  in  sticks 2.00               .20 

Cadmium  Acetate,  chem.  pure 3.00              .30 

Cadmium  Bromide,  chem.  pure 2.00               .25 

Cadmium  Carbonate,  chem.  pure 3.00              .35 

Cadmium  Chloride,  chem.  pure 2.50              .25 

Cadmium  Iodide,  chem.  pure 5.00              .50 

Cadmium  Nitrate,  chem.  pure 2.20              .25 

Cadmium  Oxide,  chem.  pure   5.00              .50 

Cadmium  Sulphate,  chem.  pure 2.20              .25 

Cadmium  Sulphide,  chem.  pure 3.50              .40 

Caesium  Chloride Grm.,  $  0.40 

Calcium  Metal .50 

Calcium  Acetate,  crude .20 

Calcium  Acetate,  chem.  pure .65              .15 

Calcium  Bisulphite,   solution 35 

Calcium  Bromide .80              .15 

Calcium  Carbide  per  2-lb.  tin,  $0.30;  10-lb.  tin,  $1.25 

Calcium  Carbonate,  precipitated   15 

Calcium  Carbonate,  chem.  pure  .70              .10 

Calcium  Chlorate   2.50              .30 

Calcium  Chloride,  crude in  5-lb.  tins,  Ib.,  $0.12  .15 

Calcium  Chloride,  crude,  granular in  5-lb.  tins,  Ib.,      .25  .30 

Calcium  Chloride,  anhydrous,  for  desiccators 40 

Calcium  Chloride,  anhydrous,  chem.  pure , .70 

Calcium  Chloride,  cryst.,  chem.  pure .40 

Calcium  Chloride,  fused,  gran.,  chem.  pure .60 

Calcium  Chromate,  chem.  pure .75              .15 

Calcium  Fluoride,  native,  powdered .10 

Calcium  Fluoride,  chem.  pure 1.50              .20 

Calcium  Formate .30 

Calcium  Hypochlorite  (chloride  of  lime) 1-lb.  cans  .15 

Calcium  Hypochlorite  (chloride  of  lime) 10-lb.  cans  .10 

Calcium  Hypochlorite,  chem.  pure 80 

Containers  Included  Unless  Otherwise  Specified. 


THE  DENVER  FIRE  CLAY  COMPANY.  387 


Pound.      Ounce. 

Calcium  Hypophosphite $1 .00  $0.20 

Calcium  lodate -60 

Calcium  Iodide  -50 

Calcium  Molybdate    3.50  .40 

Calcium  Nitrate,  chem.  pure   1-00  .20 

Calcium  Oxalate,  chem.  pure 1 .50  .20 

Calcium  Oxide,  caustic .10 

Calcium  Oxide,  pure,  from  marble .40  .15 

Calcium  Oxide,  chem.  pure 60  .15 

Calcium  Phosphate,  precip 30 

Calcium  Phosphate,  dibasic,  chem.  pure 1.00  .20 

Calcium  Phosphate,  monobasic,  pure 1.50  .20 

Calcium  Phosphate,  tribasic,  precip.,  dry 1.00  .15 

Calcium  Phosphide,  chem.  pure 2.50  .25 

Calcium  Phosphite,  chem.  pure 3.00  .35 

Calcium  Silicate,  pure 1 .00  .20 

Calcium  Sulphate  (gypsum,  plaster  paris) 10 

Calcium  Sulphate,  pure .50  .15 

Calcium  Sulphate,  chem.  pure 60  .15 

Calcium  Sulphide    .50 

Calcium  Sulphite,  com'l 25 

Calcium  Sulphite,  pure .50  .15 

Calcium  Thiosulphate  1.20  .20 

Calcium  Tungstate   2.00  .20 

Camphor,  refined 1 .20 

Canada  Balsam.     (See  Balsam  Fir.) 

Carbon  Bisulphide  (sulphur  alcohol) in  5-Ib.  tins,  lb.,  $0.20        .25 

Carbon  Bisulphide,  pure 60  .15 

Carbon  Bichloride   (C2C1J 2.00 

Carbon  Tetrachloride  (CC14) 40 

Carbon  Tetrachloride  (CC14),  chem.  pure 1.00 

Carbon  Trichloride   (C2C1C) .80 

Carborundum,  powder .50 

Carmine,  No.  40 .50 

Casein,  com'l .50  .10 

Casein,  chem.  pure 4.00  .40 

Celloidin,  in  shreds,  for  microscopic  work Box,  $1.00 

Cerium,  metal,  powd Gm.,    4.00 

Cerium  Chloride  2.50  .30 

Cerium  Nitrate   2.50  .30 

Cerium  Oxalate .60  .10 

Cerium  Oxide  3.00  .30 

Containers  Included   Unless  Otherwise  Specified. 


388  THE  DENVER  FIRE  CLAY  COMPANY. 


Pound.       Ounce. 

Cerium  Sulphate   (eerie) $0.35 

Cerium  Sulphate  (cerous)    .35 

Chalk,  in   lumps $0.10 

Chalk,  precipitated   .15 

Chalk,  red  (reddle) 20 

Chalk,  French  (talcum) 10 

Charcoal,  Animal,   granul .15 

Charcoal,  Animal,  powd .10 

Charcoal,  Animal,  purified .50 

Charcoal,  Animal,  pure 2.25 

Charcoal  from  blood,  purified  by  acid 2.50              .30 

Charcoal,  from  meat 3.00              .30 

Charcoal,  from  wood,  in  squares,  4x1  inch Doz.,  $0.50 

Charcoal,  from  wood,  powd .10 

Chloral  Hydrate,  cryst 1 .60              .20 

Chloroform,  pure .60 

Chloroform,  pure,  Squibb's    1 .25 

Chlorophyll,  chem.   pure Grm.,  $0.40 

Chlorophyll,  technical   .40 

Chromium,  metal   Grm.,  $0.60 

Chromium  Metal,  electrolytic 2.50               .25 

Chromium  Acetate,  chem.  pure   . 2.00              .25 

Chromium  Chloride,  chem.  pure,  green  crystals 1.60              .20 

Chromium  Chloride,  subl.,  sesqui  (Cr2Cl8) 1.00 

Chromium  Chloride,  subl.,  sesqui  (Cr2Cl6),  solution 2.00              .20 

Chromium  Nitrate 2.00               .25 

Chromium  Oxalate 1 .40              .20 

Chromium  Oxide  (Cr2O3),  pure 1.00              .20 

Chromium  Oxide,  hydrated  (Cr2(OH)6+4H2O) 70  .15 

Chromium  Sulphate 2.00              .25 

Cinnabar,  native ; 1 .75              .20 

Cobalt  Metal,  cubes,  98-99% 6.00              .50 

Cobalt  Metal,  chem.  pure 1 .75 

Cobalt  Acetate,  cryst 4.00              .40 

Cobalt  Arsenate,  pure 6.00              .60 

Cobalt  Carbonate,  pure 4.00              .40 

Cobalt  Chloride,  pure 2.50               .30 

Cobalt  Chromate    .40 

Cobalt  Nitrate,  pure 2.50              .30 

Cobalt  Oxide,  com'l,  "zaffre" .80              .10 

Cobalt  Oxide,   black 4.50              .45 

Containers  Included   Unless  Otherwise  Specified. 


THE  DENVER  FIRE  CLAY  COMPANY.  389 


Pound.       Ounce. 

Cobalt  Phosphate,   pure $4.00  $0.40 

Cobalt  Sulphate,  pure 2.00  .25 

Cochineal   90  .10 

Cochineal,   powd 1.00  .10 

Collodion,  U.  S.  P 90  .15 

Congo  Paper Sheet,  $0.10 

Copper  Filings 50 

Copper  Turnings   .40 

Copper,  metal,  granular,  com'l   60 

Copper,  metal,  granular,  pure  1 .50 

Copper,  metal,  foil   .50 

Copper,  metal,  foil,  pure,  Merck's,  99.95%  Cu  1.50  .15 

Copper,  metal,  fine  powder,  chem.  pure  2.50  .30 

Copper,  metal,  wire,  pure  .10 

Copper  Acetate,  basic  (verdigris)    .50 

Copper  Acetate,  chem.  pure .80  .15 

Copper  Arsenate,  chem.  pure   1.00  .15 

Copper  Arsenite,  pure  2.00  .20 

Copper  Bichloride,  pure   .60  .15 

Copper  Bromide .40 

Copper  Carbonate   40 

Copper  Carbonate,  chem.  pure  .70  .15 

Copper  Chloride,  cryst.,  pure  (bichloride)   (cupric)   .60  .15 

Copper  Chloride,  white  (monochloride)   (cuprous)    1.60  .20 

Copper   Chromate    .20 

Copper  Cyanide,  chem.  pure 1.50  .20 

Copper  Ferrocyanide   2.00  .25 

Copper  Iodide  .60 

Copper  Nitrate,  cryst.,  chem.  pure .75  .15 

Copper    Nitroprussiate .50 

Copper  Oxide,  black,  com'l,  pow'd 50 

Copper  Oxide,  black,  pow'd,  chem.  pure  .90  .15 

Copper  Oxide,  black,  granulated,  chem.  pure  1 .20  .20 

Copper  Oxide,  black,  wire  form,  chem.  pure  1.60  .20 

Copper  Oxide,  red,  pure  (cuprous)    1.50  .20 

Copper  Oxide,  red,  com'l   .50  .10 

Copper  Phosphate   .30 

Copper  Sulphate,  cryst.  (blue  vitriol)    .15 

Copper  Sulphate.    In  barrels,  special  quotation. 

Copper  Sulphate,  cryst.,  chem.  pure  .50  .15 

Copper  Sulphate,  anhydrous,  chem.  pure 1.00  .20 

Copper  Sulphide,   pow'd    1.00  .15 

Containers  Included  Unless  Otherwise  Specified. 


390  THE  DENVER  FIRE  CLAY  COMPANY. 


Pound.      Ounce. 

Copper  Sulphide,  fused  $0.80          $0.15 

Copper  Sulphocyanate   2.00  .25 

Copper  Tannate .25 

Copper  and  Ammonium  Chloride,  chem.  pure  .60  .15 

Copper  and  Ammonium  Sulphate,  chem.  pure 60  .15 

Copper  and  Potassium  Chloride,  chem.  pure  .60  .15 

Copperas    .05 

Cotton,  Absorbent .40  .10 

Cotton,    Soluble    .40 

Creosote,  from  coal  tar 70  .15 

Creosote,  from  beech  tar  1.50  .20 

Cryolite,    pow'd    20 

Curare   Grm.,  $1.50 

Dextrine,  yellow,  com'l   .15 

Dextrine,  white,  com'l  .15 

Dextrine,  pure,  prec.  by  alcohol 80  .20 

Dextrose  (grape  sugar),  chem.  pure  1.50  .20 

Diamidobenzol,  meta  (phenylenediamine  hydrochlorate)   2.00 

Diamond  Ink,  for  etching  on  glass .50 

Dianol  (developer)    .50 

Diastase  of  Malt  1.00 

Didymium,  metal,  pow'd  Grm.,  $9.00 

Didymium  Carbonate  Grm.,     .40 

Didymium  Chloride   Grm.,      .40 

Didymium  Nitrate Grm.,      .40 

Didymium  Oxide Grm.,      .40 

Didymium  Sulphate  Grm.,      .40 

Dimethyl-amido-azo-benzene   .90 

Dimethylaniline,  pure    1.00  .15 

Dimethylglyoxime  Grm.,  $0.50;   %  oz.,  $1.50 

Dinitrobenzene   (dinitrobenzol),  com'l   .  .50  .10 

Dinitrobenzene,   pure    .30 

Diphenylamine,  cryst.,  chem.  pure .25 

Diphenylamine  Sulphate,  chem.  pure  .25 

Diphenylamine  Hydrochlorate,  chem.  pure  .40 

Distilled  Water   Gal.,  $0.15 

Dutch  Metal   Book,  $0.15 

Edinol  (developer)    .75 

Eikonogen   (developer)    .40 

Emery,  finely  powdered .15 

Erbium,  metal  Grm.,  $7.50 

Eschka  Mixture   80 

Containers  Included  Unless  Otherwise  Specified. 


THE  DENVER  FIRE  CLAY  COMPANY. 


391 


Pound.      Ounce. 

Ether,  Acetic  (ethyl  acetate)    $0.80 

Ether,  Acetic,  twice  rectif 1 .50 

Ether,  Acetic,  anhydrous   2.50 

Ether,  cone,   (sulphuric),  1890   1-lb.  cans  incl.,        .45 

Ether,  cone,  (sulphuric),  1890  5-lb.  cans  incl.,        40 

Ether,  cone.,  Squibb's    1.00 

Ether,  anhydrous,  dist.  over  Sodium 2.00 

Ether  Petroleic  (rhigolene),  25°  to  45° 80 

Ethyl  Iodide    $0.60 

Eugenol .40 

Feldspar,  pow'd .10 

Ferromanganese,  80%    .30 

Fibrin,  from  blood .35 

Fire  Clay .05 

Fire  Clay In  100-lb.  sacks,  $0.50 

Fluorescein    .75 

FTuorescin .90 

Fluorspar  (calcium  fluoride),  pow'd   .10 

Special  prices  in  large  lots. 

Flux,  Black,  Plattner's  1 .75    .          .20 

Flux,  Black,  substitute .40  .10 

Flux,  Bismuth  3.00  .30 

Flux,   Richard's    • 20 

Flux,  for  lead  assays.     (See  Lead  Flux.) 

Formaldehyde  (40%)  solution  1-lb.  bottle,  inc.,        .30 

Formaldehyde  (40%)   solution  5-lb.  bottle,  inc.,        .25 

Fuller's  Earth 10 

Furfurol    .80 

Fusel  Oil  (alcohol  amylic)   Gal.,  $2.50 

Gelatine,  finest  white,  "Gold  Label"  .60 

Glass,  pow'd .10 

Glass  Wool,  finest  grade  7.00  .50 

Glucose  Gal.,  $1.00         .15 

Glycerin,  pure  In  50-lb.  cans,  lb.,  $0.30        .40 

Glycerin,  chem.  pure   . .50 

Gold,  metal,  chem.  pure,  prec.,  pow'd  Grm.,  $1.75 

Gold,  metal,  foil  and  sheet Grm.,      .85  24.00 

Gold,  metal,  leaf  Book,      .50 

Gold  Bromide 15  grains,    1.50 

Gold  Chloride 15  grains,      .50  13.00 

Gold  Chloride  and  Sodium  15  grains,      .30  7.00 

Gold   Cyanide    15  grains,    2.00 

Containers  Included  Unless  Otherwise  Specified. 


392 


THE  DENVER  FIRE  CLAY  COMPANY. 


Pound.      Ounce. 

Grape  Sugar,  com'l,  dry $0.15 

Grape  Sugar,  chem.  pure  (Dextrose)   1.50          $0.20 

Graphite,  com'l,  pow'd  .25 

Graphite,  pure,  finely  pow'd .70  .15 

Gum  Arabic,  best .65 

Gun  Cotton   (pyroxylin),  soluble   .40 

Gypsum  .10 

Haematite  (reddle) .20 

Hsernatoxylin %  oz.,         .25  1 .60 

Heavy  Spar  (barytes) .10 

Heliotropin .50 

Haemoglobin    1.10 

Hide    Powder    2.00 

Hydrogen  Peroxide,  Mallinckrodt's,  U.  S.  P 35 

Hydrogen  Peroxide,  Marchand's .90 

Hydrone  Per  2-lb.  tin,  $1.50 

Hydroquinone    1 .60  .20 

Iceland  Spar  1 .00 

Iceland  Spar,  pure,  small  crystals  5.00 

Iceland  Spar,  pure,  large  crystals 15.00 

Indigo 1.00  .15 

Indigo  Carmine,  dry .40 

Indigo  Solution   50  .10 

Indigotin,  cryst,  chem.  pure   %  oz.,  $0.60 

Indium,   metal    15  grains,  8.00 

Indium  Chloride 15  grains,    8.00 

Indium  Oxide 15  grains,    9.00 

Indium  Sulphate 15  grains,    8.00 

India  Rubber    2.50  .25 

Infusorial  Earth   (Kieselguhr)    25 

Iodine,  resublimed,  U.  S.  P 4.00  .40 

Iodine  Bromide .60 

Iodine  Chloride,  solution   .70 

lodoform    .40 

Iridium,  metal,  fused   Grm.,  $4.00 

Iridium  Chloride  (sesqui-)    Grm.,    2.00 

Indium  Oxide   (sesqui-)    Grm.,    3.00 

Iridium  Sulphate  Grm.,    2.50 

Iron,  metal,  filings,  coarse  .10 

Iron,  metal,  filings,  fine .10 

Iron,  metal,  powder,  by  alcohol .35  .10 

Iron,  metal,  powder,  chem.  pure   1.60  .20 

Containers  Included  Unless  Otherwise  Specified. 


THE  DENVER  FIRE  CLAY  COMPANY.  393 


Pound.       Ounce. 

Iron  Wire,  pure,  for  standardizing,  in  1-oz.  vials  $0.15 

Iron,  reduced  by  hydrogen  $0.75  .15 

Iron  Acetate,  chem.  pure   1 .25  .20 

Iron  Arsenate    (-ous)    .20 

Iron  Arsenite   (-ic)    .20 

Iron  Carbonate,  precip 20 

Iron  Carbonate  (-ous),  chem.  pure .40 

Iron  Chloride  (ferric),  cryst.,  pure  .40  .15 

Iron  Chloride  (ferrous  protochloride),  pure,  dry .70  .15 

Iron  Citrate,  in  scales,  U.  S.  P 80  .15 

Iron  Ferrocyanide,  blue,  insoluble  (Prussian  blue)   .75  .15 

Iron  Ferrocyanide,  blue,  soluble .75  .15 

Iron  Hydrate  (-ic),  chem.  pure .75  .15 

Iron  Hypophosphite  2.25  .25 

Iron  lodate    .70 

Iron  Iodide  (ferrous)   .45 

Iron  Malate,  in  scales  1 .20 

Iron  Nitrate  (ferric),  cryst.,  pure 1.20  .20 

Iron  Oxalate  (ferric),  in  scales 2.00  .25 

Iron  Oxalate   (ferrous)    1 .50  .20 

Iron  Oxide,  black 50  .15 

Iron  Oxide,  brown,  pure  .70  .15 

Iron  Oxide  (-ous),  chem.  pure  .90  .15 

Iron  Oxide,  red .15 

Iron  Oxide,  red,  saccharated,  soluble  .60  .15 

Iron  Oxide  (-ic),  chem.  pure 1.00  .20 

Iron  Perchloride,  cryst.,  pure  40  .15 

Iron  Persulphate   50  .15 

Iron  Phosphate  (ferric),  soluble 1.00  .15 

Iron  Phosphate  (ferrous),  precip 80  .15 

Iron  Pyrophosphate,  U.  S.  P 70  .15 

Iron  Sesquichloride,  cryst.,  pure   40  .15 

Iron  Sulphate  (ferric),  normal  (persulphate)    50  .15 

Iron  Sulphate  (ferrous)    (copperas)    ,. .05 

Special  quotation  in  quantities. 

Iron  Sulphate  (ferrous),  pure,  crystals  5-lb.  tins,  lb.,  $0.12        .15 

Iron  Sulphate  (ferrous),  chem.  pure,  precip.  by  alcohol  .50  .15 

Iron  Sulphide,  in  lumps   .15 

Special  quotations  on  large  quantities. 

Iron  Sulphide,  in  sticks .         .20 

Iron  Sulphide,  globular .20 

Containers  Included  Unless  Otherwise  Specified. 


394  THE  DENVER  FIRE  CLAY  COMPANY. 


Pound.      Ounce. 

Iron  Sulphide,  Merck's  Reagent  $0.60 

Iron  Tannate  2.50          $0.30 

Iron  Tartrate  (ferric),  in  scales .25 

Iron  Tartrate   (ferrous)    .25 

Iron  Trichloride,  cryst,  pure 40  .15 

Iron  and  Ammonium  Citrate,  brown,  scales .80              .15 

Iron  and  Ammonium  Oxalate,  cryst 90  .15 

Iron  and  Ammonium  Sulphate,  pure  (ferrous)   .60              .15 

Iron  and  Ammonium  Sulphate,  pure  (ferric)   .60              .15 

Iron  and  Potassium  Oxalate,  cryst .80              .15 

Kaolin    .10 

Special  quotations  in  quantities. 

Lacmoid,  in  scales,  chem.  pure  .30 

Lanthanum,  metal,  pow'd  Grm.,  $10.00 

Lanthanum  Chloride  Grm.,       .50 

Lanthanum  Nitrate  Grm.,       .40 

Lanthanum  Sulphate Grm.,       .40 

Lead,  metal,  granulated  (silver  lead)   Bulk  .20 

Lead,  metal,  granulated  (silver  lead)   25  and  50-lb.  sacks  .15 

Note: — This  lead  is  made  from  our  absolutely  chem.  pure  lead,  and 
is  guaranteed  to  contain  0.225  troy  oz.  of  silver,  actual  weight  per 
ton  of  lead;  consequently,  if  about  40  grammes  of  it  are  taken  in 
assaying  1-10  A.  T.  of  ore,  the  silver  assay  is  accordingly  increased 
about  3  troy  oz.  per  ton  of  ore. 

Lead,  metal,  granulated,  absolutely  chem.  pure  Bulk  .20 

Lead,  metal,  granulated,  absolutely  chem.  pure  25  and  50-lb.  sacks  .15 

Lead,  metal,  foil,  strictly  chem.  pure,  for  standardizing  .25              .10 

Lead,  metal  powder,  chem.  pure  1.00              .15 

Lead  Acetate,  white  (sugar  of  lead),  com'l  .20 

In  barrels,  market  quotation. 

Lead  Acetate,  chem.  pure  Carton  .40              .10 

Lead  Acetate,  chem.  pure,  basic   .80              .15 

Lead  Acetate,  Dr.  Home's  formula  .60 

Lead   Bromide    2.00              .25 

Lead  Carbonate,  basic,  com'l  (white  lead)   .15 

Lead  Carbonate,  chem.  pure  -70              .15 

Lead   Chloride    60 

Lead  Chloride,  chem.  pure 80  .15 

Lead  Chromate,  chem.  pure  , 1.00              .15 

Lead  Chromate,  chem.  pure,  fused  1.10              .15 

Lead  Cyanide   .25 

Lead  Ferrocyanide   .25 

Lead  Hyposulphite   (thiosulphate)    60  .10 

Containers  Included  Unless  Otherwise  Specified. 


THE  DENVER  FIRE  CLAY  COMPANY.  395 


Pound.       Ounce. 

Lead    Iodide    $0.35 

Lead  Molybdate  .70 

Lead  Nitrate,  com'l   • $0.20 

Lead  Nitrate,  chem.  pure  Carton        .40  .10 

Lead   Oxalate    1.00  .20 

Lead  Oxide  (litharge).     (See  Lead  Protoxide.) 

Lead  Oxide,  chem.  pure 1.00  .20 

Lead  Peroxide   (binoxide)    .50  .15 

Lead  Peroxide,  chem.  pure   1 .00  .20 

Lead  Phosphate,  pure $1.50          $0.20 

Lead  Protoxide  (litharge),  for  assaying  silver,  uniform  grade  .12 

Lead  Protoxide  (litharge),  for  assaying  silver,  uniform  grade,  in  25  and 

50-lb.  kegs 10 

Lead  Protoxide,  chem.  pure .20 

Lead  Protoxide,  chem.  pure,  in  25  and  50-lb.  sacks 15 

Lead  Protoxide,  anhydrous,  chem.  pure  1.20  .20 

Lead  Sesquioxide  (red  lead) .15 

Lead  Sulphate,  chem.  pure 60  .15 

Lead  Sulphide,  pure 80  .15 

Lead    Sulphite    1.00  .15 

Lead  Sulphocyanate   1.50  .20 

Lead  Tartrate    1.50  .20 

Lead  Flux,  No.  1,  Plattner's 20 

5  parts  Carbonate  Potash. 
&y2  parts  Bicarbonate  Soda. 
2y2  parts  Flour. 
2y2  parts  Borax  Glass,  ground. 

Lead  Flux,  No.  2   20 

Qy2  parts  Carbonate  Potash. 
5  parts  Bicarbonate  Soda. 

1  part  Flour. 

2y2  parts  Borax  Glass,  ground. 

Lead  Flux,  No.  3    20 

2  parts  Carbonate  Potash. 
2  parts  Bicarbonate  Soda. 
1  part  Flour. 

1  part  Borax  Glass,  ground. 

Lead  Flux,  No.  4 17 

2  parts  Carbonate  Potash. 
2  parts  Bicarbonate  Soda. 
1  part  Flour. 

1  part  Borax,  powdered. 

s 

(Above  Fluxes  in  lots  of  100  Ibs.  and  over,  5  cents  less  per  Ib.) 
Lime   (calcium  oxide)    .10 

Containers  Included   Unless  Otherwise  Specified. 


396  THE  DENVER  FIRE  CLAY  COMPANY. 


Pound.       Ounce. 

Lime  (Vienna) ,  lumps  $0.20 

Lime   (Vienna),  powder 25 

Litharge.     (See  Lead  Protoxide.) 

Lithium,  metal  Grm.,  $6.00 

Lithium  Acetate    3.00  $0.35 

Lithium  Benzoate   2.00  .25 

Lithium  Bichromate  4.00  .40 

Lithium    Bromide    2.00  .25 

Lithium    Carbonate 1.50  .20 

Lithium    Chloride    $2.50  $0.25 

Lithium  Citrate   1.50  .20 

Lithium  Iodide   5.00  .50 

Lithium  Nitrate   2.50  .25 

Lithium  Oxide,  hydrated .50 

Lithium  Phosphate  .40 

Lithium  Sulphate,  cryst .25 

Litmus,  com'l,  in  cubes  .35  .10 

Litmus,  Purified  .35 

Litmus,  red   .35 

Litmus  Paper   Sheet,  $0.05;  quire,  $0.60 

Loadstone    .50  .10 

Lycopodium    1 .00  .15 

Magnesia  Oxide,  powdered .15 

Magnesite,  native,  powder   .15 

Magnesium,  metal,  ribbon   .60 

Magnesium,  metal,  wire .60 

Magnesium,  metal,  powder  . 1-lb.  cans  3.50  .35 

Magnesium  Acetate    1.00  .20 

Magnesium  Bromide 3.00  .35 

Magnesium  Carbonate,  in  cubes  .30 

Magnesium  Carbonate,  nat.  powder .25 

Magnesium  Carbonate,  chem.  pure 1.00  .15 

Magnesium  Chloride,  cryst .35 

Magnesium  Chloride,  cryst.,  chem.  pure .40  .15 

Magnesium  Chloride,  fused,  chem.  pure .75  .20 

Magnesium  Citrate,  chem.  pure  1 .40  .20 

Magnesium  Hypophosphite    2.50  .25 

Magnesium  Iodide  6.00  .60 

Magnesium  Nitrate,  pure .70  .15 

Magnesium  Oxide  (calcined),  light  1-lb.  tins  .80  .15 

Magnesium  Oxide  (calcined),  heavy  1-lb.  tins  .80  .15 

Magnesium  Oxide,  chem.  pure  1.20  .20 

Magnesium  Phosphate,  pure   .70  .15 

Containers  Included  Unless  Otherwise  Specified. 


THE  DENVER  FIRE  CLAY  COMPANY.  397 


Pound.       Ounce. 

Magnesium  Sulphate,  com'l  (Epsom  salt)    $0.10 

Magnesium  Sulphate,  cryst.,  chem.  pure  Carton  .25 

Magnesium  Sulphate,  dry,  chem.  pure  Carton  .30 

Magnesium  Sulphite   .60  $0.15 

Magnesium  Tartrate   2.50  .30 

Maltose    1-75  .20 

Manganese,  metal,  fused,  pure  .60 

Manganese,  metal,  C.  free   2.00 

Manganese  Acetate 1.10  .15 

Manganese  Borate   .40  .10 

Manganese  Carbonate,  pure  .75  .15 

Manganese  Chloride,  cryst.,  pure  .50  .15 

Manganese  Dioxide.     (See  Manganese  Peroxide). 

Manganese    Hypophosphite    .25 

Manganese  Iodide .60 

Manganese  Nitrate,  pure    1 .50  .20 

Manganese  Oxide  (manganic)    (Mn,O3)    4.00  .40 

Manganese  Peroxide,  black  (dioxide),  natural,  pow'd  .10 

Manganese  Peroxide,  black  (dioxide),  natural,  granular .15 

Manganese  Peroxide,  black  (dioxide),  chem.  pure  1.00  .15 

Manganese  Phosphate   2.50  .25 

Manganese  Sulphate,  cryst.,  pure .60  .15 

Manganese  Tartrate  4.00  .40 

Marble,   pieces    ". .10 

Mercury,   metal    .90  .10 

Mercury,  metal,  flask,  75  Ibs.    Write  for  special  quotations. 

Mercury,   redistilled    1.20  .15 

Mercury  Acetate   (mercurous)    3.00  .30 

Mercury  Acetate  (mercuric)    2.50  .30 

Mercury  Arsenate   .40 

Mercury  Arsenite    .40 

Mercury  Bichloride  (corrosive  sublimate),  com'l   1.00  .15 

Mercury  Bichloride  (corrosive  sublimate),  granular   1.10  .15 

Mercury  Bichloride  (corrosive  sublimate),  pow'd  1.10  .15 

Mercury  Bichloride  (corrosive  sublimate),  chem.  pure,  B.  &  A 1.50  .20 

Mercury  Bichloride  (corrosive  sublimate),  chem.  pure,  Merck's '...  1.60  .25 

Mercury  Bisulphate   1 .00  .15 

Mercury  Chloride   (calomel) 1.20  .15 

Mercury  Chloride  (calomel),  cryst,  chem.  pure  1.60  .20 

Mercury  Chromate  (mercuric)    4.00  .40 

Mercury  Cyanide,  pure 4.00  .40 

Mercury  Iodide,  red  (mercuric)    3.50  .30 

Containers  Included  Unless  Otherwise  Specified. 


398  THE  DENVER  FIRE  CLAY  COMPANY. 


Pound,       Ounce. 

Mercury  Iodide,  yellow    (mercurous)    $3.25  $0.30 

Mercury  Nitrate   (mercuric)    1 .60  .25 

Mercury  Nitrate  (mercurous)    1 .60  .25 

Mercury  Oxide  (mercurous),  black  2.50  .25 

Mercury  Oxide  (mercuric),  red  1.30  .15 

Mercury  Oxide  (mercuric),  red,  chem.  pure  1.75  .25 

Mercury  Oxide  (mercuric),  yellow,  chem.  pure  2.00  .25 

Mercury  Pernitrate  1 .60  .25 

Mercury  Phosphate  (mercuric)   .45 

Mercury  Phosphate  (mercurous)   .45 

Mercury   Protochloride    1.20  .15 

Mercury  Sulphate,  basic  1.50  .20 

Mercury  Sulphate,  neutral 1.00  .15 

Mercury  Sulphate  (mercuric),  chem.  pure  1.60  .20 

Mercury  Sulphate  (mercurous),  chem.  pure 1.80  .25 

Mercury  Sulphide,  black   .90  .15 

Mercury  Sulphide,  red  (mercuric),  pow'd,  artificial  cinnabar 1.25  .20 

Mercury  Sulphide,  red  (mercuric),  cryst,  artificial  cinnabar 1.75  .25 

Mercury  Sulphocyanate    (mercuric)    3.00  .30 

Mercury  Tannate  (mercurous)    3.00  .30 

Metadiamidobenzol   .80 

Metal,  Wood's,  fusible  at  70°  3.50  .30 

Metal,  Rose's,  fusible  at  94°    3.50  .30 

Methyl  Acetate    .30 

Methyl  Iodide  .90 

Methyl  Orange  Indicator .40 

Metol  (developer)   .75 

Mica,  ground  .25 

Microcosmic  Salt  .80  .15 

Milk  Sugar,  cryst .45 

Milk  SXigar,  powder .30 

Minium    .15 

Molybdenum,  metal   Grin.,  $0.30 

Molybdenum,  metal,  95%    3.50 

Molybdenum  Oxide  (mono-) 1.10 

Molybdenum  Sulphide   1 .20 

Naphthaline,  in  flakes   .15 

Naphthaline,  pure  Carton  .50  .20 

Naphthol  Alpha,  recryst 1.50  .25 

Naphthol  Beta,  resublimed Carton  1.25  .20 

Naphthol  Nitroso-Beta  12.00  .90 

Naphthylamine,  alpha,  pure 2.50  .30 

Containers  Included  Unless  Otherwise  Specified. 


THE  DENVER  FIRE  CLAY  COMPANY. 


399 


Pound.       Ounce. 

Naphthylamine,  chloride,  alpha   ' $0.25 

Naphthylamine,  sulphate,  alpha  .30 

Nessler's  Solution  $1 .00               .20 

Nickel,  metal,  in  cubes 1.20              .15 

Nickel,  metal,  chem.  pure 1 .00 

Nickel,   sheet .20 

Nickel,  wire .20 

Nickel  Acetate   1 .80               .20 

Nickel  Carbonate  2.25              .20 

Nickel  Chloride    1.50               .20 

Nickel  Citrate .30 

Nickel  Cyanide  .60 

Nickel  Nitrate,  pure  1 .00               .20 

Nickel  Oxide,  black,  com'l * 1.20               .20 

Nickel  Oxide,  black,  chem.  pure  6.00              .75 

Nickel  Oxide,  green,  chem.  pure 1.80              .20 

Nickel   Phosphate    .35 

Nickel  Sulphate,  com'l    0.40 

Nickel  Sulphate,  chem.  pure 2.00              .25 

Nickel  and  Ammonium  Chloride 1.00               .20 

Nickel  and  Ammonium  Sulphate   25 

Nickel  and  Ammonium  Sulphate,  chem.  pure .75              .15 

Nicotine    Dram,  $0.60 

Nitre  (See  Potassium  Nitrate). 

Nitrobenzol   (oil  mirbane)    . .30 

Nitronaphthalene  .75 

Nitrosobetanaphtol    12.00               .90 

Nutgalls    ' 50 

Nutgalls,   pow'd .60 

Oil  Aniline,  pure   .60               .15 

Oil   Bergamot    6.00               .50 

Oil  Cedar   1 .20               .20 

Oil  Cloves    1.60               .20 

Oil  Fusel   Gal.,  $2.50 

Oil  Lard,  for  blow-pipe  lamps  Gal.,    1.50 

Oil  Linseed   Gal.,    1 .00 

Oil  Olive Gal.,    2.50 

Oil  Origanum    .40 

Oil  Turpentine  Gal.,  $1.00  .25 

Oil  Turpentine,  redistilled 60 

Orpiment,  powder   35 

Oxone    per  2-lb.  tin,  $1.50 

Containers  Included  Unless  Otherwise  Specified. 


400 


THE  DENVER  FIRE  CLAY  COMPANY. 


Pound.       Ounce. 

Ozokerite    '. $0.30 

Palladium,  metal  Grm.,  $1.60 

Palladium,  metal,  black  (Mohr)   Grm.,    1.75 

Palladium  Asbestos,  5%   Grm.,      .50 

Palladium  Chloride,  cryst Grm.,  2.00 

Paraffine,  pure   .20 

Paraldehyde    1 .20  $0.20 

Paris  Green  .50 

Pearl  Ash  (potassium  carbonate)    .15 

Peptone,  dry,  Witte's   1001  grm.,  $1.10 

Petrolatum    .25 

Phenacetolin   Indicator    y8  oz.,  $0.20  1.20 

Phenolphtalein,  pure    4.50  .40 

Phenylenediamine  Meta  Hydrochlorate  (metadiamidobenzol)    .80 

Phenylhydrazine,  pure  4.00  .40 

Phenylhydrazine  Hydrochlorate   4.00  .40 

Phloroglucin Grm.,  $0.25  3.50 

Phosphorus,  red,  amorphous 1.75  .25 

Phosphorus,  yellow,  in  sticks  1-lb.  cans       1.00 

Phosphorus,  yellow,  in  sticks  %-lb.  cans       1.20 

Phosphorus,  yellow,  in  sticks   ^4-lb.  cans       1.40 

Phosphorus,  yellow,  in  sticks  1-oz.  cans  .20 

Phosphorus,  yellow,  in  sticks,  thin,  for  gas  analysis  2.50  .30 

Phosphorus  Oxychloride   3.50  .40 

Phosphorus  Pentachloride    . 1.50  .30 

Phosphorus  Pentoxide  (acid  phosphoric,  anhydride)   Bottle,  $0.20       1.25  .25 

Phosphorus  Trichloride  1.50  .30 

Pipe  Clay  • 10 

Plaster  Paris  (calcium  sulphate),  com'l  .10 

Platinum,  metal,  foil  and  wire  Grm.,  $1.20 

Platinum,  metal,  manufactured  utensils.     (See  Apparatus  list.) 

Platinum,  metal,  black  precip.     (Pt.  Mohr.)    Grm.,  1.50 

Platinum,  metal,  sponges  Each,  $0.50 

Platinum  Bichloride  (platinic  chloride),  cryst.,  chem.  pure   18.00 

Platinum  Bichloride  (platinic  chloride)    Grm.,  $0.75 

Platinum  Bichloride,  5%  solution   1.25 

Platinum  and  Hydrogen  Chloride  (chlor.  platinic  acid)   Grm.,  $0.80  18.00 

Platinum  and  Potassium  Chloride  Grm.,      .75  20.00 

(All  other  Platinum  compounds  to  order  at  lowest  prices.) 
Plumbago.     (See  Graphite.) 

Potassium,  metal    Net,  incl.  tin  and  vial  1 .35 

Potassium,  metal    In  %-oz.  1.50 

Containers  Included  Unless  Otherwise  Specified. 


THE  DENVER  FIRE  CLAY  COMPANY.  401 


Pound.       Ounce. 

Potassium,  metal   In  %-oz.  $1 .60 

Potassium,  metal    In  %-oz.  2.00 

Potassium  Acetate   $0.50              .1 5 

Potassium  Acetate,  chem.  pure    .80               .15 

Potassium  Antimoniate 1.00               .15 

Potassium  Antimoniate,  pure 2.00               .25 

Potassium  Arsenate,  pure 1.00               .15 

Potassium  Arsenite,  pure   1.00              .10 

Potassium  Bicarbonate,  cryst .20 

Potassium  Bicarbonate,  pow'd  .20 

Potassium  Bicarbonate,  chem.  pure .40               .10 

Potassium  Bichromate,  com'l,  cryst .20 

Potassium  Bichromate,  com'l,  pow'd .30 

Potassium  Bichromate,  chem.  pure  Carton  .60               .10 

Potassium  Binoxalate  (salt  of  sorrel)    30 

Potassium  Binoxalate,  chem.  pure    .      .60  .15 

Potassium  Bisulphate,  cryst.,  chem.  pure  .50              .15 

Potassium  Bisulphate,  fused,  chem.  pure .65              .15 

Potassium  Bisulphite,  chem.  pure .75              .15 

Potassium   Bitartrate,   com'l    (argols)    -15 

Potassium  Bitartrate,  powder,  white  (cream  of  tartar) .40 

Potassium  Bitartrate,  chem.  pure .80              .15 

Potassium  Borotartrate   .25 

Potassium  Bromate,   chem.   pure 2.50               .30 

Potassium    Bromide    .40               .10 

Potassium  Bromide,  chem.  pure 1.00              .15 

Potassium  Carbonate,  gran,   (pearl  ash) .15 

Potassium  Carbonate,  gran,  (pearl  ash) in  cans  of  70  Ibs.  .11 

Potassium  Carbonate,  gran.     In  bbls.,  special  quotation. 

Potassium  Carbonate,  chem.  pure .50               .15 

Potassium  Carbonate,  chem.  pure,  pow'd .60              .15 

Potassium  Caustic,  com'l   10-lb.  tins,  Ib.  $0.12  .15 

Potassium  Caustic,  white,  purified,  in  sticks 40  .15 

Potassium  Caustic,  pure,  by  alcohol,  in  sticks .60              .15 

Potassium  Caustic,  strictly  chem.  pure 1.50              .20 

Potassium  Chlorate,  cryst .20 

Potassium  Chlorate,  powder  .20 

Potassium  Chlorate,  granular,  pure .40 

Potassium  Chlorate,  cryst.,  chem.  pure Carton  .45               .10 

Potassium  Chlorate,  pow'd,  chem.  pure Carton  .45              .10 

Potassium  Chloride,  pure   .25 

Potassium  Chloride,  chem.  pure Carton  .40              .10 

Containers  Included  Unless  Otherwise  Specified. 


402  THE  DENVER  FIRE  CLAY  COMPANY. 


Pound.       Ounce. 

Potassium  Chloroplatinite   $20.00 

Potassium  Chromate,  com'l   $0.35 

Potassium  Chromate,  chem.  pure Carton  .60              .15 

Potassium  Citrate    80  .15 

Potassium  Citrate,  chem.  pure 1.20              .20 

Potassium  Cobaltic  Nitrite   1.00 

Potassium  Cyanate,  pure   1 .00 

Potassium  Cyanide,  fused,  white  (for  mining),  30% 1-lb.  cans  .40              .10 

Potassium  Cyanide,  fused,  white,  30% 10-lb.  cans  .30 

Potassium  Cyanide,  fused,  50% 45 

Potassium  Cyanide,  granular,  50% .55 

Potassium  Cyanide,  granular,  98% 70 

Potassium  Cyanide,  chem.  pure  (domestic)  98  to  100% 1-lb.  cans  .50 

Potassium  Cyanide,  chem.  pure  (domestic)   98  to  100% 10-lb.  cans  .40 

Potassium  Cyanide,  chem.  pure.    In  100-lb.  or  200-lb.  cans,  special  price. 

Potassium  Cyanide,  chem.  pure,  Merck's,  98  to  100% 1-lb.  cans  .50              .15 

Potassium  Cyanide,  chem.  pure,  absolutely 3.50              .40 

Potassium  Ferricyanide  (red  prussiate  of  potash) .70              .10 

Potassium  Ferricyanide,  chem.  pure 1.00              .15 

Potassium  Ferrocyanide  (yellow  prussiate  of  potash) .30               .10 

Potassium  Ferrocyanide,  chem.  pure .60              .15 

Potassium  Fluoride,  chem.  pure 1.30              .20 

Potassium  Formate,  chem.  pure 2.50              .25 

Potassium  Hydroxide.     (See  Potassium  Caustic.) 

Potassium  Hypophosphite,  pure   1.50               .20 

Potassium  Hyposulphite   (thiosulphate),  pure 1.50               .20 

Potassium  lodate    5.00              .50 

Potassium  Iodide,  pure  3.00               .30 

Potassium  Iodide,  chem.  pure 4.00              .40 

Potassium  Manganate,  chem.  pure .65              .15 

Potassium  Metabisulphite   80  .15 

Potassium  Molybdate   .50 

Potassium  Nitrate,  cryst .12 

(Special  quotation  in  barrel  lots.) 

Potassium  Nitrate,  granul .12 

(Special  quotation  in  barrel  lots.) 

Potassium  Nitrate,  cryst.,  chem.  pure .40              .15 

Potassium  Nitrate,  powder,  chem.  pure Carton  .40              .10 

Potassium  Nitrite,  pure  .65               .15 

Potassium  Nitrite,  in  sticks,  chem.  pure 1.25              .20 

Potassium  Nitroprusside  .80 

Potassium  Oxalate,  neutral,  pure .30 

Containers  Included  Unless  Otherwise  Specified. 


THE  DENVER  FIRE  CLAY  COMPANY.  403 


Pound.       Ounce. 

Potassium  Oxalate,  chem.  pure $0.60  $0.1 5 

Potassium  Perchlorate,  chem.  pure,  B.  &  A 1 .50  .20 

Potassium  Permanganate,  small  crystals .25 

Potassium  Permanganate,  cryst.,  pure Carton  .35  .10 

Potassium  Permanganate,  chem.  pure,  B.  &  A .70  .15 

Potassium  Persulphate  2.00  .20 

Potassium  Phosphate,  chem.  pure,  monobasic 1.00  .15 

Potassium  Phosphate,  chem.  pure,  dibasic 1.00  .15 

Potassium  Silicate  Solution  (water  glass) .40  .10 

Potassium  Silicate,  dry,  chem.  pure   1.50  .20 

Potassium  Silico  Fluoride,  pure   2.00  .25 

Potassium  Stannate,  pure  2.50  .30 

Potassium  Sulphate  .15 

Potassium  Sulphate,  chem.  pure Carton  .35  .10 

Potassium  Sulphide,  fused  (liver  of  sulphur) 30 

Potassium  Sulphide,  chem.  pure   .80  .15 

Potassium  Sulphite   60  .15 

Potassium  Sulphite,  chem.  pure 1.00  .20 

Potassium  Sulphocarbonate   .70  .15 

Potassium  Sulphocyanate,  chem.  pure 1.00  .15 

Potassium  Tartrate,  chem.  pure    .90  .15 

Potassium   Tetra-Oxalate    1 .20  .20 

Potassium   Xanthogenate,   pure    2.00  .30 

Potassium  and  Zinc  Cyanide    2.00  .20 

Pumice  Stone,  lumps   .12 

Pumice  Stone,  powder    .10 

Putty  Powder  (tin  oxide,  gray)    .75  .10 

Pyoktanin,  blue    2.00 

Pyoktanin,  yellow   2.00 

Pyridine,  pure  2.50  .30 

Pyrocatechin   .80 

Pyroxelyn  (gun  cotton)    .40 

Quartz,    powdered    .10 

Quicksilver.     (See  Mercury.) 

Raffinose  2.50 

Realgar,    powder    40 

Reddle,  in  sticks,  for  marking  crucibles,  etc .20 

Resorcin    1 .60  .20 

Rochelle  Salt  (sodium  and  potassium  tartrate),  pow'd 35  .10 

Rosaniline,  pure   .40 

Rosaniline  Acetate    .40 

Rosaniline  Hydrochloride    .40 

Containers  Included  Unless  Otherwise  Specified. 


404 


THE  DENVER  FIRE  CLAY  COMPANY. 


Pound.       Ounce. 

Rosin    $0.1 0 

Rubidium,  metal,  pure 1-10  grm.,  $1.50 

Rubidium  Carbonate    G  rm.,      .20 

Rubidium  Iodide    Grm.,      .20 

Rubidium  Sulphate   Grm.,      .20 

Ruthenium,  metal    Grm.,    6.00 

Ruthenium  Chloride,  cryst Grm.,    2.50 

Ruthenium  Oxychloride   1%  grain,    1.75 

Saccharin    (Garantose)     $0.30 

Sal  Ammoniac  in  lumps .20 

Sal  Ammoniac,  granular,  white .15 

Sal  Soda  .05 

Salt,  in  sacks   .03 

Saltpetre .12 

Sea  Sand   .10 

Sealing  Wax,  best,  red,  extra  No.  6 25 

Selenium,  metal,  pure,  in  sticks 1 .80 

Shellac,    orange    70 

Silica,  powdered,  com'l    .05 

(Special  prices  in  quantities.) 

Silicon,  metal,  cryst Grm.,  $0.30 

Silicon,  metal,   amorphous %   oz.,      .40  2.00 

Silicon  Chloride-tetra per  10-grm.  tube,      .80 

Silver,  metal,  foil,  chem.  pure 1 .25 

Silver,  metal,  precipitated    2.00 

Silver,  metal,  leaf Per  book,  $0.15 

Silver,  metal,  granulated,  chem.  pure 1.00 

Silver  Acetate   1 .60 

Silver  Bromide    1.40 

Silver  Carbonate   1 .50 

Silver  Chloride    1.00 

Silver  Cyanide  1.25 

Silver  Iodide   1.25 

Silver  Nitrate,  pure,  cryst.,  Mall 8.00               .65 

Silver  Nitrate,  chem.  pure,  B.  &  A 10.00              .80 

Silver  Nitrate,  Merck's  Reagent    18.00             1.25 

Silver  Nitrite  1.80 

Silver  Oxide 1.50 

Silver  Phosphate    2.00 

Silver  Sulphate   1.25 

Soda  Ash  (sodium  carbonate) 10 

Containers  Included  Unless  Otherwise  Specified. 


THE  DENVER  FIRE  CLAY  COMPANY.  405 


Pound.       Ounce. 

Soda  Caustic,  in  drums  $0.05 

Soda  Lime,  granul 55  $0.15 

Sodium,  metal   Tins  1 .00               .30 

Sodium,  metal  in  *&,  Ib.  1 .20 

Sodium,  metal  in  *4  Ib.  1 .40 

Sodium  Amalgam 1.50              .20 

Sodium  Acetate,  pure,  granular   .20 

Sodium  Acetate,  chem.  pure,  cryst .40              .15 

Sodium  Acetate,  chem.  pure,  fused .60              .15 

Sodium  Alizarinsulfonate   .30 

Sodium  Arsenate    .25 

Sodium  Arsenate,  pure  .60              .15 

Sodium  Arsenite   .25 

Sodium  Arsenite,  pure  .80               .15 

Sodium  Biborate.     (See  Borax.) 

Sodium  Biborate,  cryst.,  chem.  pure .50              .15 

Sodium  Biborate,  pow'd,  chem.  pure .50  .15 

Sodium  Bicarbonate,  com'l  .10 

Sodium  Bicarbonate in  112-lb.  kegs  .03 

Sodium  Bicarbonate,  com'l in  barrels  of  400  Ibs.     Special  quotation 

Sodium  Bicarbonate,  cryst.,  chem.  pure Carton  .25              .10 

Sodium  Bicarbonate,  pow'd,  chem.  pure Carton  .25              .10 

Sodium  Bichromate,  com'l  .20 

Sodium  Bichromate,  chem.  pure .55               .15 

Sodium  Bismuthate .40 

Sodium  Bisulphate,  cryst.,  chem.  pure .50              .15 

Sodium  Bisulphate,  fused,  chem.  pure .60              .15 

Sodium  Bisulphite,  dry,  com'l .30               .15 

Sodium  Bisulphite,  dry,  pure   .40               .15 

Sodium  Bitartrate    1.10               .20 

Sodium  Bromate  1 .40              .20 

Sodium  Bromide  .50               .15 

Sodium  Carbonate,  cryst.  (sal  soda) .05 

(Special  quotation  in  barrels.) 

Sodium  Carbonate,  pure,  cryst 1-lb.  cans  .20 

Sodium  Carbonate,  pure,  cryst 5-lb.  cans  .15 

Sodium  Carbonate,  dry,  for  assaying 20 

Sodium  Carbonate,  dry,  for  assaying in  kegs  of  130  Ibs.  .10 

Sodium  Carbonate,  calcined,  for  assaying in  kegs  of  100  Ibs.  .08 

Sodium  Carbonate,  cryst.,  chem.  pure  Bottle  .40              .15 

Sodium  Carbonate,  anhydrous,  chem.  pure Carton  .30               .10 

Containers  Included  Unless  Otherwise  Specified. 


406  THE  DENVER  FIRE  CLAY  COMPANY. 


Pound.       Ounce. 

Sodium  Caustic,  98%,  granular 10-lb.  cans    $0.12 

Sodium  Caustic,  white,  purified,  in  sticks 40  $0.15 

Sodium  Caustic,  pure,  by  alcohol,  in  sticks .60  .15 

Sodium  Caustic,  from  sodium,  chem.  pure 2.00  .25 

Sodium  Caustic  with  Lime  (soda  lime),  granul .55  .15 

Sodium  Chlorate,  pure,  granular   ; .40 

Sodium  Chlorate,  chem.  pure  .60  .15 

Sodium  Chloride,  cryst,  chem.  pure Carton        .30  .10 

Sodium  Chloride,  fused,  chem.  pure 70  .15 

Sodium  Chromate,  chem.  pure 1.00  .15 

Sodium  Citrate   90  .15 

Sodium  Cyanide  1-lb.  bottle        .65 

Sodium  Cyanide  10-lb.  tins        .50 

Sodium  Ferrocyanide,  pure  .90  .15 

Sodium  Fluoride,  pure   90  .15 

Sodium  Formate,  pure   1.20  .20 

Sodium  Hypophosphits 1.10  .20 

Sodium  Hyposulphate .50 

Sodium  Hyposulphite  (thiosulphate),  cryst.  or  granular .10 

Sodium  Hyposulphite,  cryst.  or  granular in  112-lb.  kegs         .04 

Sodium  Hyposulphite,  chem.  pure in  bottles        ,35  .15 

Sodium  Hyposulphite,  chem.  pure in  carton         .25  .10 

Sodium    lodate    6.00  .65 

Sodium  Iodide   4.00  .40 

Sodium  Metaphosphate   .20 

Sodium  Methylate,  dry  pure .80 

Sodium  Molybdate   4.00  .40 

Sodium  Nitrate,  granul.,  com'l  .10 

Sodium  Nitrate,  chem.  pure   .40  .15 

Sodium  Nitrite,  com'l   25 

Sodium  Nitrite,  cryst.,  chem.  pure  .50  .15 

Sodium  Nitrite,  in  sticks,  chem.  pure . .  .         .90  .15 

Sodium  Nitroprussiate    .60 

Sodium  Oleate   1 .00  .20 

Sodium  Oxalate,  chem.  pure  .80  ,15 

Sodium  Oxalate,  "Sorensen,"  Merck's  Reagent  .40 

Sodium  Permanganate   50 

Sodium  Peroxide    1-lb.  cans       1 .00 

Sodium  Peroxide  10-lb.  cans        .80 

Sodium  Peroxide,  chem.  pure 1 .25 

Sodium  Peroxide,  free  from  Carbon,  for  Calorimeter 1.80 

Containers  Included  Unless  Otherwise  Specified. 


THE  DENVER  FIRE  CLAY  COMPANY.  407 


Pound.       Ounce. 

Sodium  Phosphate  (di-sodic  phosphate) $0.20 

Sodium  Phosphate,  cryst,  chem.  pure 35  $0.15 

Sodium  Phosphate,  dry,  chem.  pure .60  .15 

Sodium  Phosphate,  tribasic,  chem.  pure 1.00  .15 

Sodium  Phosphite    .40 

Sodium  Phosphomolybdate   .75 

Sodium  Phosphotungstate  .60 

Sodium  Plumbate  1.20  .20 

Sodium  Pyrophosphate,  cryst.,  pure   .60  .15 

Sodium  Selenate 2.50 

Sodium  Silicate,  dry 15 

Sodium  Silicate,  solution  (water  glass) Bottle,  $0.10        .10 

Sodium  Silicate,  cryst,  pure   1.00  .15 

Sodium  Silico  Fluoride  1.00  .15 

Sodium  Stannate,  pure .80  .15 

Sodium  Sulphate,  com'l   (Glauber  salts) .10 

Sodium  Sulphate,  cryst.,  chem.  pure .35  .15 

Sodium  Sulphate,  dry,  chem.  pure Carton        .35  .10 

Sodium  Sulphide,  cryst in  400-lb.  bbls.         .05 

Sodium  Sulphide,  cryst.,  pure   .50  .15 

Sodium  Sulphide,  fused,  com .40  .15 

Sodium  Sulphide,  fused,  pure 70  .15 

Sodium  Sulphite,  cryst 1-lb.  cans        .1 5 

Sodium  Sulphite,  cryst 5-lb.  cans        .12 

Sodium  Sulphite,  recryst.,  pure  , .35 

Sodium  Sulphite,  dry,  powder  1-lb.  cans        .20 

Sodium  Sulphite,  dry  powder 5-lb.  boxes        .15 

Sodium  Sulphite,  cryst.,  pure Bottle        .35  .1 5 

Sodium  Sulphite,  dry,  pure   Carton         .35  .10 

Sodium   Sulphocyanate,  cryst.,  pure .25 

Sodium  Tartrate,  cryst.,  pure    .80  .15 

Sodium  Tungstate   1 .50  .20 

Sodium  Uranate  (uranium  yellow)    .60 

Sodium  Urate    .60 

Sodium   Xanthogenate    .25 

Sodium  and  Ammon.  Phosphate  (microcosmic  salt),  chem.  pure 80  .15 

Sodium  and  Potassium  Tartrate,  cryst.  (Rochelle  salts) 40 

Sodium  and  Potassium  Tartrate,  pow'd  (Rochelle  salts) 40 

Sodium  and  Potassium  Tartrate,  chem.  pure .60  .15 

Sponges,  for  laboratory  use Ib.  $0.50  to  $2.50 

Stannum.     (See  Tin.) 

Containers  Included  Unless  Otherwise  Specified. 


408  THE  DENVER  FIRE  CLAY  COMPANY. 


Pound.       Ounce. 
Starch    $0.1 5 

Starch,  Iodized    $0.35 

Starch,  Soluble,  Zulkowsky's   .50 

Starch,  Soluble,  Merck's   1.50  .25 

Stearine    .30 

Stibium.     (See  Antimony.) 

Strontium,  metal,  from  amalgam 1-10  grm.,  $0.75 

Strontium,  metal,  by  electrolysis 1-10  grm.,    1.50 

Strontium  Acetate  1 .60  .20 

Strontium  Carbonate,  com'l   .30  .10 

Strontium  Carbonate,  chem.  pure  .60  .15 

Strontium  Chloride,  com'l  .30  .10 

Strontium  Chloride,  chem.  pure   60  .15 

Strontium  Chromate   .25 

Strontium  Nitrate,  com'l   .20 

Strontium  Nitrate,  chem.  pure   .60  .15 

Strontium  Oxide,  hydrated,  cryst.,  pure 1.00  .15 

Strontium  Oxide,  chem.  pure  2.00  .25 

Strontium  Sulphate,  chem.  pure  .60  .15 

Sulphur,  in  rolls  (brimstone) .10 

(Special  price  in  quantities.) 

Sulphur  Flour,  sublimed  (flowers  of  sulphur)   10 

Sulphur,  precipitated,  pure    .30 

Sulphur,  cryst .40  .10 

Sulphur,   cryst.,   pure    .75  .15 

Sulphur  Chloride   75  .15 

Sulphur  Dioxide,  in  20-oz.  tins  Tin,  $0.60 

Sulphur  Dioxide,  in  70-oz.  valve  top  tins  Tin,    4.00 

Tannin.     (See  Acid  Tannic.) 

Talcum   Powder    .10 

Tellurium,  metal,  powder  Grm.,  $0.50 

Tellurium,  metal,  in  sticks   Grm.,      .50 

Terra  Alba 10 

Test  Papers,  blue  and  red  litmus  and  turmeric; 

In  small  books    Each,  $0.05;  Doz.    $0.50 

In  sheets  Each,      .05;  quire,      .60 

Thallium,  metal    Grm.,      .20 

Thallium  Acetate  Grm.,      .35 

Thallium  Bromide   Grm.,      .35 

Thallium   Carbonate    Grm.,      .35 

Thallium  Chloride   Grm.,      .30 

Thallium  Iodide    , Grm.,      .50 

Containers  Included  Unless  Otherwise  Specified. 


THE  DENVER  FIRE  CLAY  COMPANY.  409 


Pound.       Ounce. 

Thallium   Nitrate    Grm.,  $0.25 

Thallium  Oxide  (thallic)    Grm.,      .30 

Thallium  Oxide   (thallous)    Grm.,      .30 

Thallium  Sulphate  Grm.,      .25 

Thorium,  metal 1-10  Grm.,    2.50 

Thorium  Oxide    , $2.00 

Thorium  Nitrate .70 

Thorium  Sulphate    1.80 

Thymol,  pure  $3.00              .30 

Thymol  Iodide   (Aristol)    6.00               .60 

Tin,  metal,  in  bars   80  .10 

Tin,  metal,  foil,  s.  c.  tobacco  foil .25 

Tin,  metal,  foil,  thin  tissue 50 

Tin,  metal,  foil,  pure   .75               .10 

Tin,  metal,  granulated,  com'l  (mossy) .75               .10 

Tin,  metal,  granulated,  pure,  B.  &  A.'s .90               .10 

Tin,  metal,  granulated,  fine,  pure,  Merck's 1.25              .15 

Tin,  metal,  powdered,  pure,  B.  &  A.'s 1.00              .15 

Tin,  metal,  in  sticks,  pure,  B.  &  A.'s 75  .10 

Tin  Bichloride  (fuming  tetrachloride)    tin  and  g.  s.  b.  2.00              .40 

Tin  Chloride  (stannous  chloride)  protochloride,  chem.  pure .80              .15 

Tin  Chloride  (stannic  chloride),  chem.  pure  .75              .15 

Tin  Oxide,  white  (stannic)   90  .15 

Tin  Oxide,  white,  pure  (stannic)   1.10              .15 

Tin  Oxide,  gray  (putty  powder)   .60              .15 

Tin  Oxide,  black  (stannous),  pure  1.50              .20 

Tin  Sulphate   (stannous)    1.25               .20 

Tin  Sulphide  (stannous)    1 .50              .20 

Titanium,  metal,  powder  Grm.,  $0.80 

Titanium  Chloride    Grm.,  $0.25 

Titanium  Oxide    .80 

Toluidine    (ortho)    .20 

Toluidine  (ortho),  pure  .60 

Toluidine    (para)    .20 

Toluidine  (para),  pure  .25 

Toluidine  Sulphate    .40 

Toluol   (toluene) ,  com'l .35 

Toluol  (toluene),  pure  .60              .15 

Tripoli,  powder    .15 

Tropaeolin  "OO"  or  "OOO"  .30 

Tungsten,  metal  (wolfram),  com'l   1.50              .15 

Containers  Included  Unless  Otherwise  Specified. 


410  THE  DENVER  FIRE  CLAY  COMPANY. 


Pound.      Ounce. 

Tungsten,  chem.  pure  $0.80 

Turmeric  Powder  $0.25 

Turmeric  Paper Sheet,  $0.05;   quire,  $0.60 

Uranium,  metal,  fused  Grm.,      .70 

Uranium  Acetate 6.00  .60 

Uranium  Acetate,  chem.  pure,  free  from  sodium 9.00  .90 

Uranium  Nitrate,  chem.  pure 5.50  .50 

Uranium  Oxide,  black,  pure .80 

Uranium  Oxide,  red  (uranic  acid),  pure .80 

Uranium  Oxide,  yellow  (sodium  uranate)   .60 

Uranium  Sulphate   .60 

Urea,  cryst.,  pure  (carbamide)    3.50  .35 

Urea  Nitrate   3.50  .35 

Urea  Sulphate  .60 

Vanadium,  metal,  pow'd   Grm.,  $3.50 

Vanadium  Sulphide    Grm.,      .40 

Vanillin    .75 

Vaseline,  yellow  incl.  can        .30 

Vaseline,  white  incl.  can        .60 

Vienna  Lime,  lumps   20 

Vienna  Lime,  powder   25 

Water  Glass.     (See  Potassium  Silicate  or  Sodium  Silicate.) 

Wax,  yellow 50  .10 

Wax,  white 70  .10 

Whiting    10 

Wolfram,  metal.     (See  Tungsten.) 
Wood  Alcohol.     (See  Alcohol  Methylic.) 

Xylol  (xylene),  pure   .60  .15 

Yttrium,  metal,  powder  Grm.,  $7.50 

Yttrium  Carbonate Grm.,    1 .00 

Yttrium  Nitrate   Grm.,      .50 

Yttrium  Oxide,  anhydrous   Grm.,      .40 

Zinc,  metal  (spelter),  in  slabs .15 

Zinc,  metal,  shavings  .25 

(100  Ib.  and  ton  lots,  special  quotations.) 

Zinc,  metal,  sheet   TO 

Zinc,  metal,  sheet,  cut  in  strips 25 

Zinc,  metal,  sheet,  chem.  pure  .50 

Zinc,  metal,  in  sticks,  Merck's,  chem.  pure 50  .10 

Zinc,  metal,  in  sticks,  pure,  absolutely  free  from  As .40  .10 

Zinc,  metal,  granulated  (mossy) .25 

Containers  Included  Unless  Otherwise  Specified. 


THE  DENVER  FIRE  CLAY  COMPANY.  411 


Pound.      Ounce. 

Zinc,  metal,  granulated  (mossy),  pure  $0.40  $0.10 

Zinc,  metal,  granulated,  Merck's,  chem.  pure .55  .10 

Zinc,  metal,  powdered  (dust)    .30 

Zinc,  metal,  powdered  (dust),  in  35-lb.  tins .25 

Zinc,  metal,  powdered,  Merck's,  chem.  pure  (coarse)   .55  .10 

Zinc,  metal,  powdered,  B.  &  A.'s,  chem.  pure,  20  mesh .50  .10 

Zinc,  metal,  powdered,  B.  &  A.'s,  chem.  pure,  30  mesh .45  .10 

Zinc,  metal,  shot,  B.  &  A.'s,  chem.  pure .40  .10 

Zinc  Acetate,  cryst.,  pure  .50  .15 

Zinc  Carbonate,  precip .30  .10 

Zinc  Carbonate,  precip.,  pure   •  .60  .15 

Zinc  Chloride,  com'l    .30  .10 

Zinc  Chloride,  granul.,  pure   .40  .15 

Zinc  Chloride,  fused,  pure  .60  .15 

Zinc  Cyanide,  pure  .25 

Zinc  Iodide  .50 

Zinc  Nitrate,  pure  .75  .15 

Zinc  Oxide,  by  wet  process,  chem.  pure Carton  .40  .10 

Zinc  Oxide,  chem.  pure,  free  from  Mn.,  B.  &  A.'s .50  .15 

Zinc  Oxide,  by  dry  process .20 

Zinc  Phosphate,  chem.  pure  1 .25  .20 

Zinc  Phosphide .30 

• 

Zinc  Sulphate  (white  vitriol),  com'l   .10 

Zinc  Sulphate,  cryst.,  chem.  pure Carton  .25  .10 

Zinc  Sulphide,  pure  1 .50  .20 

Zinc  Sulphite  .20 

Zinc  and  Potassium  Cyanide   2.00  .20 

Zirconium,  metal Grm.,  $0.60 

Zirconium  Nitrate,  cryst .80 

Zirconium  Oxide,  anhydrous    1.40 

Zirconium  Sulphate ;  JQ 

Containers  Included  Unless  Otherwise  Specified. 


INDEX 


Page 


Absorption   Blocks    240 

Absorption  Paper   325 

Absorption  Tubes    320-321 

Acidometers    1 

Acid  Bottles   96 

Acid  Brushes    103 

Acid  Pumps    1 

Acid  Test  Bottles   97 

Actinometers    206 

Adapters    253 

Agate  Mortars   226 

Agateware  Casseroles   113 

Agateware   Dippers    147 

Agateware   Dishes    149 

Agateware  Funnels    166 

Agateware  Measures    219 

Agitators,  Hendryx  Cyanide 2-3 

Air   Baths    151 

Airmeters    5 

Air  Testers   1 

Albuminometer   330 

Alcohol  Burners  109-110 

Alcohol   Lamps    212 

Alcohol  Stoves  272 

Alcoholometers   204-205 

Alembic  Salleron   1-307 

Alkalimeters   4 

Aluminum  Beakers  86 

Aluminum  Dishes   150 

Alward  Balance  67 

Amalgam   Buckets    107 


Page 

Amalgam   Knives    211 

Amalgamators    228 

Amalgamating  Pads 257 

Amalgamating  Scoops   260 

Amber  Bottles   96 

Analytical  Balances   40  to  49 

Analytical  Weights   69-72 

Anatomical  Jars    209 

Anemometers    5 

Aneroid  Barometers 77 

Annealing  Cups   6, 128 

Annealing  Cup  Trays    6 

Annunciator  Wire  297 

Anvils   6,  7 

Apparatus,  Physical — See  Special  Cat- 
alogue. 

Apparatus  for — 

Arsenic  determination 304 

Blowpipe  analysis    301-303 

Carbonic  Acid  determination  . . .   304 

Cement  testing  306 

Colorimetric  determination   ....   305 
Decomposition  of  Water,  etc.  308-311 

Distilling  268-269,  307 

Electrolysis   308-313 

Extraction    314 

Gas  analysis 315-323 

Gas  drying    315-316 

Gas  generation 274,  311,  321 

Gas  washing  323 

Iron   analysis    324 

Milk  analysis    325 

Nitrogen  determination   326 


THE  DENVER  FIRE  CLAY  COMPANY. 


413 


Page 

Oxygen   determination    316 

Specific  gravity  determination..   327 

Soil  analysis  32? 

Spectrum  analysis    328 

Steel   analysis    324 

Sugar  analysis   329 

Urine  analysis  330-331 

Aprons,  Rubber   257 

Arch  Reducer  237 

Arches,  Muffle   237 

Argand  Burner    108 

Arsenic  Plates    273 

Arsenic  Tubes    293 

Asbestos    7 

Asbestos  Gloves  and  Mittens   ....   200 

Asbestos  Pads   8 

Aspirator  Bottles    96 

Aspirators,  of  Zinc   8 

Assay  Balances  10-61 

Assay  Balances,  Pocket   38 

Assay  Furnaces  169-185 

Assay  Outfits 338-341 

Assay  Ton  Pipettes    241 

Assay  Ton  Weights  70-71 

Autoclave    147 

Avoirdupois  Weights   76 

B 

Babo's   Generator    274 

Bags,   Paper    240 

Bags,  Sampling   240,  260 

Baker's  Scale   62 

Balance  Covers    65 

Balances   10-61 

Balances,  Analytical   40-49 

Balances,  Assay    10-39 

Balances,  Bullion   56-61 

Balances,  Button    10-39 

Balances,  Chemical   50-53 

Balances,  Pocket 38-64 

Balances,  Portable 36-39 

Balances,  Prescription  62,  63 

Balances,  Pulp 50-53 

Balances,  Specific  Gravity 66-67 


Page 

Balances,  Spiral   66 

Balance,  Triple  Beam   67 

Ball  Scales   56 

Ball    Mills    225 

Balsam  Bottles 97 

Barometers  77-78 

Barometer  Tubes    78 

Baskets,  Wire   297 

Baths,  Sand   261 

Battersea  Annealing  Cups   6 

Batteries   80-83 

Battery  Cells    84 

Battery   Connections    84 

Battery  Jars   84 

Beads,  Glass  199 

Beaker  Brushes   103 

Beaker  Clamps    115 

Beaker  Covers  199-293 

Beakers,  Aluminum    86 

Beakers,  Copper    .    86 

Beakers,  Glass 85-86 

Beakers,  Porcelain   86 

Bell  Buttons   87 

Bell  Glasses    87 

Bellows,  Foot   90 

Bellows,  Hand  92-257 

Bells,   Electric    87 

Benzine  Burners    109-110 

Billow's  Oil  Burner    194 

Binding  Posts  84 

Binding  Screws   84 

Black  Lead  Crucibles    124 

Black  Lead  Stirrers  124 

Blast  Lamps  88-89 

Blocks,  Absorption   240 

Blowers    90-92 

Blower,  High  Pressure   91 

Blowpipes   93-94 

Blowpipe  Tanks  176 

Blowpipe  Apparatus   301-303 

Blowpipe  Balances   66 

Blowpipe  Lamps 212-213 

Blowpipe  Minerals 345-346 

Blowpipe  Outfits  .        .  176,  301,  337-338 


414 


THE  DENVER  FIRE  CLAY  COMPANY. 


Page 

Blowpipe,   Oxy-Hydrogen    92 

Boats,  Combustion  117,  243 

Boats,  Platinum  243 

Bone  Spoons  266 

Bone   Spatulas    264 

Bonn  Generator   274 

Books   349-365 

Bosworth   Furnaces    174 

Bottle  Brushes   103 

Bottle  Rests    253 

Bottle  Caps  102 

Bottles   95-102 

Bottles,  Spectrum   32S 

Brass  Gauze   298 

Brazing  Blowpipes  93-94 

Bricks,  of  Fire  Clay 366-372 

Brooms  102 

Brown's  Furnace  175 

Brushes   103-104 

Buckbcards    134 

Buckboard  Brushes    104 

Buckets,  Amalgam    107 

Bulbs,  Nitrogen   238 

Bulbs,  Potash    247-248 

Bulbs,  Rubber    257 

Bulb  Tubes   293 

Bullion  Brushes   104 

Bullion  Furnaces   188-190 

Bullion  Furnaces 172, 190 

Bullion  Mixer,  Clay   190 

Bullion  Moulds  229-230 

Bullion  Scales  56-61 

Bunsen  Batteries 80 

Bunsen  Burners   108-110 

Bunsen  Clamps   115-116 

Burettes    105-107 

Burette  Attachments   107 

Burette  Brushes    103 

Burette  Caps 107 

Burette  Clamps  115-116 

Burette  Floats   107 

Burette  Supports   276-278 

Burette  Tips   107 

Burners    .  .    108-111, 192-195 


Page 

Burner,  High  Temperature   Ill 

Burners,  Gas 195 

Burners,  Gasoline 192-194 

Burners,  Oil    194 

Burner  Attachments Ill 

Burro  Furnace  174 

Button  Balances  10-39 

Button  Brushes    104 

Button  Pliers    246 

Button  Trays    113 

Button  Weights .  69-72 


Cadwell's  Crucibles    128 

Calcimeter  304 

Calcium  Chloride  Tubes 291 

Calorimeters   114 

Camel  Hair  Brushes    103 

Capillary  Tubing  198 

Capsules,  Platinum 243 

Capsules,  Weighing   65 

Carbon  Tubes  324 

Carbonic   Acid   Determination  Ap- 
paratus        4,  304-305 

Carbonic  Acid  Flasks 162 

Carboy  Inclinator    113 

Gary  Burners   194 

Case  for  Filters 158 

Case  Burners,  Gasoline 192-194 

Case  Burner  for  Gas   195 

Caseite  Cupels   .  . 140 

Case  Improved  Samplers   259 

Casseroles    113 

Cement  Testing  Apparatus    306 

Centrifuge   112 

Chamois  Skins  113 

Charcoal 113 

Charcoal  Borers   301 

Charcoal  Crucibles   301 

Charcoal  Holders    301 

Charcoal  Saws  301 

Charcoal  Squares  and  Covers 301 

Charts,  Spectrum   328 


THE  DENVER  FIRE  CLAY  COMPANY. 


415 


Page 

Chemicals  375-411 

Chemists'  Slide  Rule  265 

Chemical  Apparatus  342-345 

Chrome  Steel  Crushers  134 

Clamps 115-116 

Clamp  Holders  116 

Clay  Bullion  Mixer  190 

Clay  Capsules 302 

Clay  Crucibles 125-127,  302 

Clay  Cylinders  302 

Clay  Mixer,  Bullion   190 

Clay  Stirrers 124 

Clay  Tubes  116 

Cloth,  Rubber 257 

Cloth,  Wire   298 

Cobalt  Bottles    97 

Coin  Test  Bottles    97 

Collections  345-346 

Color  Comparators  305 

Color  Test  Plates 117 

Colorimeters    '305 

Columbia  Battery   81 

Combustion  Boats 117 

Combustion  Furnaces 117 

Combustion  Spoons 145 

Combustion  Tubes  119 

Combustion  Tubing    198 

Compasses  119 

Compressing  Bottles 97 

Compressors   115 

Concentrate  Samplers  258 

Condenser  Clamps    116 

Condenser  Supports   278 

Condensing  Tubes 292 

Condensers    120 

Cone  and  Spiral,  Platinum 243 

Cones,  Platinum 243 

Cones,  Pyrometer  252 

Connecting  Tubes  292 

Connections,  Battery 84 

Copper  Beakers  86 

Copper  Crucibles  129 

Copper  Flasks    .   161 


Page 

Copper  Funnels   168 

Copper  Gauze  298 

Copper  Retorts 254 

Copper  Wire  297 

Corks 121 

Corkborers    121 

Corkborer  Sharpener  121 

Cork  Knives    121 

Cork  Plates 121 

Cork  Presses 121 

Corkscrews 121 

Creamometers   325 

Cream  Tubes 325 

Crowfoot  Battery 80 

Crown  Tops Ill 

Crucible  Stirrers  124 

Crucible  Tongs 285 

Crucibles  123-129 

Crucibles,  Cast  Iron  129 

Crucibles,  Black  Lead  124 

Crucibles,  Clay   125-127, 302 

Crucibles,  Denver 125-127 

Crucibles,  Hessian   128 

Crucibles,  Nickel  129 

Crucibles,  Porcelain  128 

Crucibles,  Platinum   244 

Crucibles,  Plumbago    124 

Crucibles,  Silver 129 

Crucibles,  Spun  Iron   129 

Crucibles,  Spun  Copper 129 

Crushers 130-139 

Crystal  Models  346 

Crystallizing  Dishes 148 

Culture  Dishes  150 

Cupel  Machine 141-142 

Cupel  Moulds   141 

Cupel  Rake  142 

Cupel  Shovel 142 

Cupel  Tongs   285 

Cupel  Trays   142 

Cupels  ,141 

Cupola  Blocks 371 


THE  DENVER  FIRE  CLAY  COMPANY. 


Page 

Cups,  Annealing 6 

Cups,  Miners'   142 

Cups,  Silica  Fusion  6 

Cutters,  Glass 199 

Cutting  Diamonds 146 

Cyanide  Agitators 2-3 

Cylinder  and  Spiral,  Platinum  ....  244 

Cylinder  Brushes 103 

Cylinder  Lining  369 

Cylinders,  Glass,  Graduated    143 

Cylinders,  Glass,  Plain  143 

D 

Dangler  Lamps  213 

Daniell  Battery  80 

Decomposing  Apparatus 309-311 

Deflagration  Spoons   145 

Demijohns    144 

Desiccators    145-146 

Desiccator  Dishes   146 

Desiccator  Plates    146 

Desks,  Laboratory 331 

Dialysers  146 

Diamonds  146 

Diamond  Mortars 226 

Dies,  Steel  and  Iron 146-147 

Digester 147 

Digesting  Flasks   162 

Dippers,  Quicksilver 147 

Dipping  Baskets 273 

Dipping  Needle 119 

Disc  Sample  Grinder,  Iler's  . . .  135-139 

Dishes,  Aluminum 150 

Dishes,  Crystallizing 148 

Dishes,   Desiccator    146 

Dishes,  Electroquartz 149 

Dishes,  Evaporating 148-149 

Dishes,  Glass 148-149 

Dishes,  Lead 149 

Dishes,  Nickel 150 

Dishes,  Petri 150 

Dishes,  Platinum 243-245 

Dishes,  Porcelain 148-149* 

Dishes,  Preparation    150 


Page 

Dishes,  Roasting  255 

Dishes,  Silver 150 

Dishes,  Staining 150 

Dishes,  Stender  150 

Dishes,  Sugar  150 

Dispensing  Scale  63 

Distilling  Apparatus  307 

Distilling  Flasks  163 

Distilling  Tubes 292 

Dixon's  Crucibles   123-124 

Domestic  Water  Still  269 

Doors,  Furnace 173 

Doors,  Muffle 237 

Drill,  Sampling 260 

Dropping  Bottles  97 

Dropping  Funnels  167 

Dry  Batteries   81 

Dryer,  Filter  158 

Drying  Apparatus   151 

Drying  Baths  151-153 

Drying  Cylinders  143 

Drying  Ovens 151-153 

Drying  Pans 238 

Drying  Trays    290 

Drying  Tubes 291 


Edison  Primary  Batteries   82-83 

Eggertz'  Carbon  Tubes  324 

Electric  Bells  87 

Electric  Combustion  Furnace  ....  118 

Electric  Drying  Ovens 153 

Electric  Fan  Blower 184 

Electric  Flask  Heater 163 

Electric  Plates 203 

Electric  Water  Heater  296 

Electrolysis  Apparatus   308-313 

Electrolytic  Stands 281 

Electroquartz  Dishes   149 

Electroquartz  Tubing 119 

Emery  Cloth  154 

Emery  Paper 154 

Envelopes,  Mailing 240 

Erdmann's  Floats   .                    107 


THE  DENVER  FIRE  CLAY  COMPANY. 


417 


Page 

Erdmann's  Furnace    186 

Eudiometers    318 

Evaporating  Burners   110 

Evaporating  Dishes   148-149 

Extraction  Apparatus  314 

Extraction  Flasks   162 

Extraction   Shells    .                            .  314 


Fan  Blower  184 

Feet  of  Glass,  for  Balances 65 

Felt  Filters  158 

Fermentation   Tubes    330 

Figures,  Steel  and  Iron 146-147 

File  Handles  154 

Files   154 

Filter  Bags   158 

Filter  Boats,  Platinum  243 

Filter  Case   158 

Filter  Cones    243 

Filter  Dryer  158 

Filter  Flasks 162 

Filter  Funnels  165-166 

Filter  Paper  155-157 

Filter  Plates  159 

Filter  Press   158-159 

Filter  Pumps 160 

Filter  Rings  158 

Filter  Stands  279-280 

Filter  Tubes   292 

Filtering  Apparatus,  Fitzgerald's.  .   159 

Filters    156-158 

Finger  Cots  160 

Fire  Bricks  367-370 

Fire  Clay  Material  366-368 

Fire  Clay  Stirrers  124 

Fitzgerald's  Filtering  Apparatus..   159 

Flask  Heater,  Electrical   163 

Flasks,  of  Glass,  Various 161-163 

Fletcher's  Blast  Lamps 89 

Fletcher's  Blowers    90 

Fletcher's  Blowpipes  93-94 

Fletcher's  Burners   110-111 

Florence  Flasks  .  .   161 


Page 

Florentine  Receivers   253 

Flux  Scales  64 

Foil,  Platinum    245 

Foot  Blowers  or  Bellows 90 

Forceps,  Various 164-246 

Fractional  distillation  ....  163,  292,  307 

Fractional  Flasks   163 

Funnel  Supports  279-280 

Funnel  Tubes   168 

Funnels,  Various 165-168 

Furnace  Doors  173 

Furnace  Stools 190 

Furnaces,  Combustion 117-118 

Furnaces,  Various 169-191 

Fused  Silica  Crucibles 129 

Fusibility  Scale   .   345 


Gas  Absorption  Tubes 320-321 

Gas  Analysis  Apparatus 315-320 

Gas  Bags   321 

Gas  Bottles   162 

Gas  Burettes   317-318 

Gas  Burners 108-111, 195 

Gas  Collecting  Tubes 322-323 

Gas  Distributors    322 

Gas  Drying  Apparatus   315-316 

Gases 196 

Gas  Eudiometers  318 

Gas  Furnaces 183-184, 186, 188-189 

Gas  Generators   274, 321 

Gas  Holders  321-323 

Gas  Measuring  Tubes   318 

Gas  Pipettes    319-320 

Gas  Pliers   247 

Gas  Pressure  Regulator   323 

Gas  Regulators  322 

Gas  Stoves    273 

Gas  Tubing  258 

Gas  Washing  Bottles 323 

Gas  Washing  Apparatus 315-316 

Gasoline  Burners   192-194 

Gasoline  Furnaces  177-190 

Gasoline  Gas  Burners.  .108-111, 192-195 


418 


THE  DENVER  FIRE  CLAY  COMPANY. 


Page 

Gasoline  Lamps 213-214 

Gasoline  Stoves  273 

Gasometer  Tubes    318 

Gauge,  Micrometer  298 

Gauge,  Wire    298 

Gauze,  Platinum    245 

Gauze  Tops  Ill 

Gauze,  Wire 298 

Generating  Flasks 162 

Generators,  Gas  274 

German  Silver  Dishes   150 

Giles'  Flasks 163 

Gilmore's  Needles  306 

Glass  Beads 199 

Glass  Brushes  103 

Glass  Covers   199-329 

Glass  Cutters    199 

Glass  Feet  for  Balances  65 

Glass  Funnels   165-168 

Glass   Mortars    226 

Glass  Plates   199 

Glass  Powder  199 

Glass  Receivers  253 

Glass  Retorts   254 

Glass  Rods 199 

Glass  Spatulas  264 

Glass  Stirrers  199 

Glass  Syphons    281 

Glass  Troughs    290 

Glass  Tubing   198 

Glass  Wool   19'J 

Glazed  Paper    238 

Gloves  200 

Goggles  200 

Gold  Washing  Horns  201 

Gold  Washing  Pans   200 

Gold  Weights 75-76 

Gooch  Crucibles 128,  244 

Gooch  Tubes 292 

Graduated  Cylinders 143 

Graduated  Flasks   163 

Graduates 201 

Grain  Weights  75-76 

Gramme  Weights   69-74 


Page 

Grate  Bars 173 

Gravity  Battery 80 

Grenet  Batteries   81 

Grinders,  Tier's  Disc   135-139 

H 

Hammers   202 

Hand  Bellows  92,  257 

Hand  Scales  62-65 

Hardness  Scale   345 

Harvard  Trip  Scale   63 

Heaters,  Soldering  Iron 264 

Hempel's  Gas  Apparatus 319-320 

Hendryx  Cyanide  Agitators 2-3 

Hessian  Crucibles 128 

High  Pressure  Blower 91 

High  Temperature  Burner Ill 

Hofmann's  Apparatus 308-310 

Hofmeister's  Dishes   325 

Holt's  Apparatus  325 

Homeopathic  Vials   95 

Horismascope   330 

Horn  Scoops 260-261 

Horn  Spatulas   264 

Horn  Spoons 266 

Horns,  Gold  Washing 201 

Horns,  Sampling   260 

Hot  Plates 203-261 

Hot  Water  Funnels 168 

Hydrocarbon  Burners 192-194 

Hydrometer  Jars  143 

Hydrometers   204-206 

Hydrometer  Scales 66-67 

Hydrostatic  Balances 66 

I 

Ignition  Tubes 282,  292-293 

Iler's  Cupel  Machine  141-142 

Iler's  Disc  Grinder 135-139 

Incinerating  Dishes,  Platinum 244 

Incubators 207-208 

Induction  Coils 208 

Ingot  Moulds  229 

Iron  analysis 324 

Iron  Crucibles    129 


THE  DENVER  FIRE  CLAY  COMPANY. 


419 


Page 

Iron  Figures  146-147 

Iron  Gauze 298 

Iron  Letters  146-147 

Iron  Mortars  227 

Iron  Retorts    255 

Iron  Wire 297 

Ivory  Spoons   266 

J 

Jars,  Anatomical   209 

Jars,  Battery 84 

Jars,  Museum  209 

Jars,  Precipitating   210 

Jars,  Screw  Cap    210 

Jars,  Specie 210 

Jars,  Specimen 209 

Jars,  Stoneware 210 

Jars,  Storage    210 

Jewelers'  Blowpipes 94 

Jewell  Stills   268 

Johnson  Zinc  Shaving  Lathe 299 

Jolly's  Balance 66 

Jones'  Reductor  324 

Jones'  Samplers 258 


Kellogg  Lamps 214 

Kerosene  Stoves    272 

Kipp's  Generators    274 

Kjeldahl  Flasks  162 

Knives,  Amalgam    211 

Knives,  .Cork    121 

Knives,  Glass   211 

Kohlrausch  Flasks    .  .   163 


Label  Books   211 

Labels  211 

Laboratory  Desks   332 

Laboratory  Filter  Press   .' 159 

Laboratory  Scale   63 

Lactobutyrometers    325 

Lactometers    206 

Lactoscopes    325 

Ladles  .   211 


Page 

Lamps    212-215 

Lamps,  Polariscope    329 

Laurence-Smith's  Crucible   244 

Lead  Dishes   149 

Lead  Foil   215 

Lead  Measures   215 

Lead  Pipe   240 

Lead  Sieves   303 

Leclanche  Batteries  80 

Lenses   218-219 

Letters,  Steel  and  Iron 146-147 

Leveling  Stands    217 

Levels  215 

Liter  Flasks    163 

Litmus  Paper  238 

Litmus  Pencils 217-240 

Low's  Flasks    162 

M 

Magnets    217 

Magnifiers 218-219 

Mailing  Envelopes  240 

Mallets    217 

Manila  Paper   240 

Mattrass  Holders    302 

Mattrass  Tongs .   285 

Mattrasses    302 

Measures,  Agateware 219 

Measures  for  Test  Lead  215 

Measuring  Tapes  219 

Medicine  Droppers   241 

Melting  Furnaces 172, 186, 190 

Melting  Ladles 211 

Mercury  Jars    '.  .  . .   143 

Mercury  Retorts   -.-.-.   255 

Mercury  Troughs 290 

Meter  Sticks 258 

Microscopes   220-224 

Midget  Gasoline  Burner  194 

Milk  analysis    325 

Milk  Dishes   150-245 

Milk  Testers   206,  325 

Mills,  Ball   225 

Mills,  Grinding .248 


420 


THE  DENVER  FIRE  CLAY  COMPANY. 


Page 

Mills,  Rolling   - 256 

Minerals  345 

Miners'  Cups    142 

Miners'  Dipping  Needle    119 

Miners'  Gold  Pans 200 

Miners'  Pocket  Scales  64 

Mittens,  Asbestos   200 

Mixer,  Bullion    190 

Mixing  Bottles   97 

Mixing  Capsules 302 

Mixing  Cylinders 143 

Mixing  Horns 260 

Mohr's  Balance   68 

Moist  Chambers   150 

Moisture  Scales 54-55 

Monitor  Still  1 

Mortars    226-228 

Motors   132-297 

Moulds  229-230 

Muffle  Arches  237 

Muffle  Coolers    237 

Muffle  Doors  237 

Muffle  Scrapers    285 

Muffles    231-236 

Mullers    134 

Museum  Jars     209 

N 

Nessler's  Jars   143 

Nickel  Crucibles   129 

Nickel  Dishes 150 

Nickel  Spatulas 264-266 

Nickel  Triangles   289 

Nippers    164 

Nitrogen  determination 326 

Nitrogen  Bulbs  238 

Nitrometers   .                                     .  326 


Office  Wire   297 

Oil   Burner 194 

Oil  Sample  Bottles  95 

Oil  Stoves   .                                         .  272 


Page 

Oil  Testers   , 238 

Ore  Crushers  130-134 

Ore  Sample  Bags   240 

Ore  Sample  Bottles  95 

Ore  Samplers 258-260 

Outfits,  Assay 338-340 

Outfits,  Blowpipe  337-338 

Outfits,  Chemical   342-345 

Outfits,  Prospectors' 337,  338,  340 

Outfits,  Students' 342,  345 

Oxygen  Retorts  254-255 

Oxy-Hydrogen    Blowpipe    92 


Pads,  Rubber   257 

Palette  Knives  266 

Palladium  Tube  320 

Pans,  Drying 238 

Pans,  Gold  Washing 200 

Pans,  Sampling  260 

Pans,  Scale  65 

Paper  Bags  240 

Papers 238,  240 

Parchment  Paper  240 

Parting  Apparatus 239 

Parting  Flasks   161-162 

Parting  Lamps 215 

Pencils,  Camel  Hair 103 

Pencils,  Litmus   217, 240 

Pencils,  Writing    240 

Percolators    240 

Petri  Dishes   150 

Physical  Apparatus.     (See  Special 
Catalogue.) 

Picks,  Prospecting    202 

Pinchcocks    115 

Pioscopes     325 

Pipes,  Block  Tin  240 

Pipes,  Lead ' 240 

Pipette  Rests   241 

Pipette  Stands  281 

Pipettes  241,  319-320 

Plate  and  Rubber  134 

Plates,  Color  Test 117 


THE  DENVER  FIRE  CLAY  COMPANY. 


421 


Page 

Plates,  Desiccator   146 

Plates,  Filter    159 

Plates,  Glass  199 

Platinum  Goods 243-246 

Pliers   246-247 

Plumbago  Crucibles  123-124 

Plumbago  Stirrers    124 

Pneumatic  Troughs    290 

Pocket  Assay  Balance  38 

Pocket  Scales   38,  64-65 

Pokers    247 

Polariscope  Lamps  329 

Polariscopes    329 

Polarization  Flasks 163 

Polarization  Tubes   329 

Policeman,  Rubber   257 

Porcelain  Casseroles   113 

Porcelain   Crucibles    128 

Porcelain  Dishes    148-149 

Porcelain   Funnels    166 

Porcelain   Mortars    226 

Porcelain   Retorts    254 

Porcelain    Rings    255 

Porcelain  Spatulas   266 

Porcelain   Strainers    273 

Porous  Cells   84 

Portable  Assay  Balances    36-39 

Potash  Bulbs  247-248 

Pouring  Moulds    229-230 

Powder  Bottles    95 

Precipitating  Jars    210 

Preparation   Dishes    150 

Prescription  Bottles    95-96 

Prescription  Scales   62-64 

Press,  Filter    158-159 

Press  for  Meats,  Herbs,  etc 248 

Pressure  Bottles   97 

Pressure   Flasks    163 

Prospector's  Outfits    337,  338,  340 

Pulp  Balances   50-53,  66 

Pulverizers  134-139 

Pumps,  Acid   1 

Pumps,  Filtering  160 

Purinometer    .  .   330 


Page 

Push  Buttons   87 

Pyrometer   Cones    252 

Pyrometers  248-251 

Pyrometers,  Electrical   249-251 


Quartz  Plates  329 

Quicksilver  Buckets  107 

Quicksilver  Dippers   147 

Quicksilver  Retorts    255 

R 

Radial  Burners    Ill 

Rake,  Cupel    142 

Ralston  Still    269 

Reading  Glasses    219 

Reagent  Bottles   100-102 

Receivers   253 

Reducers,  Muffle  Arch 237 

Reduction  Tubes 293 

Respirators    253 

Rests  for  Bottles  253 

Rests  for  Pipettes    241 

Retort  Adapters    253 

Retort  Stands   278-279 

Retorts   253-255 

Revolving  Support    275 

Ribbed  Funnels   165 

Richard's  Waterblast 92 

Riders    71-73 

Ring  Burners    HI 

Ring  Cylinders  143 

Rings,  Filter  158 

Rings,  Porcelain    255 

Ring  Stands  276-279 

Roasting  Dishes 255 

Roasting  Pans    238 

Robervahl   Scales    63 

Rods,  Glass  199 

Rolling  Mills  256 

Root's  Blower   90 

Rose's  Crucibles   128 

Rotary  Glass  Cutter 199 

Rubber  Bulb  257 

Rubber  Funnels  .  .166 


422 


THE  DENVER  FIRE  CLAY  COMPANY. 


Page 

Rubber  Goods,  Soft 257-258 

Rubber  Gloves  200 

Rubber  Stoppers  257 

Rubber  Tubing 258 

Ruhmkorff  Coils    208 

Rules    .  .   258 


Saccharometers  or  Hydrometers..  206 
Saccharometers  or  Polariscopes. .  329 
Saccharometers  for  Urine  Testing  330 

Saddle  Scales  65 

Safety  Tubes    168 

Saltmouth  Bottles   96 

Sample  Grinders,  Iler's   135-139 

Samplers    258-260 

Sampling  Bags  240,  260 

Sampling  Drill   260 

Sampling  Horns    260 

Sampling  Scoops   260-261 

Samson   Battery    81 

Sand  Crucibles 128 

Sandbaths    261 

Sand  Samplers 258 

Scale  Covers 65 

Scale  Feet 65 

Scale  Pans   65 

Scale  Rubber  Pads 65 

Scales,  Baker's   62 

Scales,  Ball  56 

Scales,  Blowpipe   66 

Scales,  Bullion 56-61,  68 

Scales,  Dispensing 63,  68 

Scales,  Flux  64 

Scales,  Hand   64-65 

Scales,  Harvard  Trip  63 

Scales,  Laboratory   63,  68 

Scales,  Moisture  54-55 

Scales,  Pocket  64-65 

Scales,  Prescription 62,  68 

Scales,  Pulp  50-53,  68 

Scales,  Robervahl  63 

Scales,  Saddle 65 

Scales,  Scoop  63-64 


Page 

Scales,  Specie  58-61 

Scales,  Specific  Gravity 66-67 

Scales,  Union  63 

Scoop  Scales   63-64 

Scoops,  Sampling 2CO-261 

Scorifier  Tongs    285 

Scorifiers    262 

Scrapers,    Muffle 285 

Screw  Cap  Bottles    £5 

Screw  Cap  Jars  210 

Screw  Clamps    115 

Seger  Pyrometer  Cones   252 

Separatory  Funnels    167 

Sets,  Chemical    342-345 

Sets,  Physical.    (See  Special  Cata- 
logue.) 

Sheeting,   Rubber    257 

Shovel,  Cupel   142 

Show  Bottles    210 

Sieves 263-264 

Silica  Fusion  Cups  6 

Silver  Crucibles   129 

Silver  Dishes    150 

Slag  Forceps  164 

Slag  Moulds  229-230 

Sleeves,    Rubber    257 

Slide  Rule,  Chemists' 265 

Slime  Pans   238 

Sodium  Spoons    266 

Soil  analysis 327 

Soldering  Coppers 264 

Soldering  Iron   Heaters    264 

Soldering   Lamp    213 

Spatulas   245,264,266 

Special  Muffles 235-236 

Specie  Scales    58-61 

Specific  Gravity  Balances   66-67 

Specific  Gravity  Bottles   98 

Specimen  Bottles    95 

Specimen  Jars   209 

Spectroscopes    328 

Spectrum  Analysis   328 

Spigots    270-271 

Spirit  Lamps  212-213 


THE  DENVER  FIRE  CLAY  COMPANY. 


423 


Page 

Sponges,  Platinum    245 

Spoons    145,  245,  266 

Spot  Plates   117 

Staining  Dishes   150 

Stamps,  Steel    146-147 

Steel  Dies  146-147 

Steel  Figures   146 

Steel  Letters    147 

Steel  Mortars   226 

Steel  Spatulas   266 

Steel  Stamps   146-147 

Steele-Harvey  Furnaces   191 

Stender   Dishes    150 

Sterilizers    147,  267 

Stills  268,269 

Stirrcrs,  Black  Lead    124 

Stirrers,   Fire   Clay    124 

Stirrers,  Glass    199 

Stirrers,  Rubber    257 

Stools  for  Furnaces  190 

Stopcocks    270-271 

Stoppers,   Rubber    257 

Storage  Jars  210 

Stoves    272-273 

Strainers    273 

Streak  Plates   273 

Sugar  Analysis    329 

Sugar  Dishes 150,  245 

Sugar  Flasks    163 

Sugar  Weights    76 

Sulphuretted  Hydrogen  Generators  274 

Supports    275-281 

Support  Tables    281 

Syphons    281 

T 

Table  Clamps  116 

Tapes,  Measuring   219 

Test  Glasses  282 

Test  Lead  Measures    215 

Test  Lead  Sieves   303 

Test  Paper 238,  282 

Test  Plates,  Color 117 

Test  Tube  Brushes  .  .    103 


Page 

Test  Tube  Caps  282 

Test  Tube  Clamps   115 

Test  Tube  Supports  280 

Test  Tubes    282 

Thermometers   283-284 

Thistle  Tubes  168 

Tile  371-373 

Tilting  Furnaces   191 

Tincture  Bottles    96 

Tintometer    305 

Tips,    Platinum    246 

Tips,   Rubber  ' 257 

Titration  Apparatus   107 

Tongs    285 

Transit    286-288 

Trays 113,  280 

Trays,  Annealing  Cup 6,  290 

Trays,  Button  113 

Trays,  Cupel  142 

Triangles    246-289 

Tripods   290 

Troughs    290 

Troy  Weights  74-76 

Tube  Brushes  103 

Tubes,  Asbestos    7 

Tubes,  Barometer  78 

Tubes,  Clay 116 

Tubes,  Combustion 119 

Tubes,    Cream    325 

Tubes,  Inversion   329 

Tubes,  Polariscope   329 

Tubes,    Spectrum    328 

Tubes,  Various   291-292 

Tubing,  Glass   198 

Tubing,  Rubber   258 

Turmeric  Paper  238 

Twitchell's  Acidometers  1 

u 

U-Tubes    291 

Union  Scale    63 

Universal   Support    281 


424 


THE  DENVER  FIRE  CLAY  COMPANY. 


Page 

Ureometers   331 

Urine  analysis 330-331 

Urinometers    .  .   331 


Vanning  Placques   200,  293 

Vicat's  Identing  Apparatus   306 

Vinegar  Testers  1 ,  206 

Vises   293 

Voltameters    311 

Volumeters    316 

Volumetric  Flasks    163 

w 

Walther's  Filtering  Flasks    162 

Washbottles  98-99 

Watchglass   Clamps    293 

Watchglasses    293 

Watchglasses  for  Scales 65 

Water  Baths   294-295 

Water  Blasts    92 

Water  Heater 296 

Water  Motors 297 

Water  Stills  268-269 

Wedgewood  Mortars 227 

Weighing  Bottles   99 


Page 

Weighing  Capsules  65 

Weights,  Analytical 69-74 

Weights,  Assay  Ton 70,  71,  72 

Weights,  Avoirdupois    76 

Weights,   Gold    76 

Weights,  Gramme   C9-74 

Weights,  Sugar   76 

Weights,  Troy  74-75 

Westphal  Balance    66 

Whiskbrooms   102 

Wicks   212,  215,  273 

Wine  Testers  1, 206 

Wing  Tops    Ill 

Wire,  Copper    297 

Wire,  Iron 297 

Wire,  Platinum   246 

Wire    Baskets    297 

Wire  Brushes  104 

Wire  Gauges    298 

Wire   Gauze    298 

Woulff  Bottles    99 

Writing  Diamonds    146 


Zinc  Shaving  Lathe 


299 


